fix: integration tests running on PRs from forks (#1504)

## Description

* Allows integration tests to run via `repository_dispatch` events when
PRs are opened from forks

Credit: https://github.com/imjohnbo/ok-to-test

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [X] 💻 CI/Deployment
- [ ] 🐹 Trivial/Minor

## Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic
words" - "closes, fixes" to auto-close the Github issue. -->
* ALC-635

## Test Plan

<!-- How will this be tested prior to merging.-->
- [X] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

.github/workflows/ci.yml

@@ -1,11 +1,16 @@
 name: Build/Release Corso
 on:
   workflow_dispatch:
+
   pull_request:
+
   push:
     branches: [main]
     tags: ["v*.*.*"]
 
+  repository_dispatch:
+    types: [ok-to-test-command]
+
 permissions:
   # required to retrieve AWS credentials
   id-token: write
@@ -131,16 +136,18 @@ jobs:
           name: docs
           path: docs/build
 
-
   # ----------------------------------------------------------------------------------------------------
   # --- Integration and Unit Testing -------------------------------------------------------------------
   # ----------------------------------------------------------------------------------------------------
 
-  Test-Suite:
+  Test-Suite-Trusted:
     needs: [Precheck, Checkout]
     environment: Testing
     runs-on: ubuntu-latest
-    if: startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/main' || needs.precheck.outputs.srcfileschanged == 'true'
+    if: (startsWith(github.ref, 'refs/tags/') ||
+      github.ref == 'refs/heads/main' ||
+      needs.precheck.outputs.srcfileschanged == 'true') &&
+      github.event.pull_request.head.repo.full_name == github.repository
     defaults:
       run:
         working-directory: src
@@ -195,6 +202,109 @@ jobs:
           if-no-files-found: error
           retention-days: 14
 
+  Test-Suite-Fork:
+    needs: [Precheck]
+    environment: Testing
+    if: (needs.precheck.outputs.srcfileschanged == 'true' &&
+      github.event.pull_request.head.repo.full_name != github.repository) # only run when repo is forked
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src
+    steps:
+      - name: Fail check
+        if: github.event_name != 'repository_dispatch'
+        run: |
+          echo "Workflow requires approval from a maintainer to run. It will be automatically rerun on approval."
+          exit 1
+
+      # add comment to PR with link to workflow run
+      - uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          message: |
+            https://github.com/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID
+
+      # Check out merge commit
+      - name: Fork based /ok-to-test checkout
+        uses: actions/checkout@v2
+        with:
+          ref: "refs/pull/${{ github.event.client_payload.pull_request.number }}/merge"
+
+      - name: Setup Golang with cache
+        uses: magnetikonline/action-golang-cache@v3
+        with:
+          go-version-file: src/go.mod
+
+      - run: mkdir testlog
+
+      # Install gotestfmt
+      - name: Set up gotestfmt
+        run: go install github.com/gotesttools/gotestfmt/v2/cmd/gotestfmt@latest
+
+      # AWS creds
+      - name: Configure AWS credentials from Test account
+        uses: aws-actions/configure-aws-credentials@v1
+        with:
+          role-to-assume: ${{ secrets.AWS_IAM_ROLE }}
+          role-session-name: integration-testing
+          aws-region: us-east-1
+
+      # run the tests
+      - name: Integration Tests
+        env:
+          AZURE_CLIENT_ID: ${{ secrets.CLIENT_ID }}
+          AZURE_CLIENT_SECRET: ${{ secrets.CLIENT_SECRET }}
+          AZURE_TENANT_ID: ${{ secrets.TENANT_ID }}
+          CORSO_CI_TESTS: true
+          CORSO_M365_TEST_USER_ID: ${{ secrets.CORSO_M365_TEST_USER_ID }}
+          CORSO_PASSPHRASE: ${{ secrets.INTEGRATION_TEST_CORSO_PASSPHRASE }}
+        run: |
+          set -euo pipefail
+          go test \
+          -json   \
+          -v      \
+          ./... 2>&1 | tee ./testlog/gotest.log | gotestfmt -hide successful-tests
+
+      # Upload the original go test log as an artifact for later review.
+      - name: Upload test log
+        if: failure()
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-log
+          path: src/testlog/gotest.log
+          if-no-files-found: error
+          retention-days: 14
+
+      # Update check run called "Test-Suite-Fork"
+      - uses: actions/github-script@v5
+        id: update-check-run
+        if: ${{ always() }}
+        env:
+          number: ${{ github.event.client_payload.pull_request.number }}
+          job: ${{ github.job }}
+          # Conveniently, job.status maps to https://developer.github.com/v3/checks/runs/#update-a-check-run
+          conclusion: ${{ job.status }}
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { data: pull } = await github.rest.pulls.get({
+              ...context.repo,
+              pull_number: process.env.number
+            });
+            const ref = pull.head.sha;
+            const { data: checks } = await github.rest.checks.listForRef({
+              ...context.repo,
+              ref
+            });
+            const check = checks.check_runs.filter(c => c.name === process.env.job);
+            const { data: result } = await github.rest.checks.update({
+              ...context.repo,
+              check_run_id: check[0].id,
+              status: 'completed',
+              conclusion: process.env.conclusion
+            });
+            return result;
+
   # ----------------------------------------------------------------------------------------------------
   # --- Source Code Linting ----------------------------------------------------------------------------
   # ----------------------------------------------------------------------------------------------------
@@ -234,7 +344,7 @@ jobs:
   # ----------------------------------------------------------------------------------------------------
 
   Publish-Binary:
-    needs: [Test-Suite, Linting, Docs-Linting, SetEnv]
+    needs: [Test-Suite-Trusted, Linting, Docs-Linting, SetEnv]
     environment: ${{ needs.SetEnv.outputs.environment }}
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/main'
@@ -271,7 +381,7 @@ jobs:
           path: src/dist/*
 
   Publish-Docs:
-    needs: [Test-Suite, Linting, Docs-Linting, SetEnv]
+    needs: [Test-Suite-Trusted, Linting, Docs-Linting, SetEnv]
     environment: ${{ needs.SetEnv.outputs.environment }}
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/main'
@@ -309,7 +419,7 @@ jobs:
           aws cloudfront create-invalidation --distribution-id ${{ secrets.DOCS_CF_DISTRIBUTION }} --paths "/*"
 
   Publish-Image:
-    needs: [Test-Suite, Linting, Docs-Linting, SetEnv]
+    needs: [Test-Suite-Trusted, Linting, Docs-Linting, SetEnv]
     environment: ${{ needs.SetEnv.outputs.environment }}
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/main'

.github/workflows/ok-to-test.yml

@@ -0,0 +1,31 @@
+# If someone with write access comments "/ok-to-test" on a pull request, emit a repository_dispatch event
+name: Ok To Test
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  ok-to-test:
+    runs-on: ubuntu-latest
+    # Only run for PRs, not issue comments
+    if: ${{ github.event.issue.pull_request }}
+    steps:
+      - name: Generate token
+        id: generate_token
+        uses: tibdex/github-app-token@v1
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.PRIVATE_KEY }}
+
+      - name: Slash Command Dispatch
+        uses: peter-evans/slash-command-dispatch@v1
+        env:
+          TOKEN: ${{ steps.generate_token.outputs.token }}
+        with:
+          token: ${{ env.TOKEN }} # GitHub App installation access token
+          reaction-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-type: pull-request
+          commands: ok-to-test
+          named-args: true
+          permission: write