Merge pull request #158 from Shopify/add-auto-merge

Add Dependabot auto merge config

.github/workflows/dependabot_auto_merge.yml

@@ -0,0 +1,93 @@
+name: Dependabot auto-merge
+on: pull_request_target
+
+jobs:
+  dependabot:
+    runs-on: shopify-ubuntu-latest
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.6.0
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+
+      - name: Waiting for CI to finish
+        id: check_ci_failure
+        continue-on-error: true
+        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.dependency-group == 'auto_merge' }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            function sleep(ms) {
+              return new Promise(resolve => setTimeout(resolve, ms))
+            }
+            const query = `query ($org: String!, $repo: String!, $pullRequestNumber: Int!) {
+                            organization(login: $org) {
+                              repository(name: $repo) {
+                                pullRequest(number: $pullRequestNumber) {
+                                  commits(last: 1) {
+                                    nodes {
+                                      commit {
+                                        status {
+                                          state
+                                        }
+                                      }
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          }`;
+            const variables = {
+              org: context.repo.owner,
+              repo: context.repo.repo,
+              pullRequestNumber: context.issue.number
+            }
+            // Try for 30 minutes
+            let attempts = 30
+            let ci_state = false
+            for (let i = 1; i <= attempts; i++) {
+              console.log(`Sleeping for 60 seconds`)
+              await sleep(60000)
+              const result = await github.graphql(query, variables)
+              const state = result["organization"]["repository"]["pullRequest"]["commits"]["nodes"][0]["commit"]["status"]["state"]
+              console.log(`Status is ${state} after ${i} attempts`)
+              if (state === "SUCCESS") {
+                ci_state = true
+                console.log("Proceeding with workflow as CI succeed")
+                break
+              }
+            }
+            core.setOutput("ci_state", ci_state)
+      - name: Send Slack notification if auto-merge failed
+        if: ${{ steps.check_ci_failure.outputs.ci_state == 'false' }}
+        uses: ruby/action-slack@v3.0.0
+        with:
+          payload: |
+            {
+              "attachments": [{
+                  "text": "Auto-merge failed for pull request <${{ github.event.pull_request.html_url }}|#${{ github.event.pull_request.number }}> in repository ${{ github.repository }}",
+                  "color": "danger"
+                }
+              ]
+            }
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.METRICS_SLACK_WEBHOOK_URL }}
+
+      - name: Approve and merge
+        if: ${{ steps.check_ci_failure.outputs.ci_state == 'true' && (steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.dependency-group == 'auto_merge') }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            await github.rest.pulls.createReview({
+              pull_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              event: 'APPROVE',
+            })
+            await github.rest.pulls.merge({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            })