[datadog-operator] Update Github Workflow for Milestone

.github/PULL_REQUEST_TEMPLATE.md

@@ -24,7 +24,6 @@ Write there any instructions and details you may have to test your PR.
 ### Checklist
 
 - [ ] PR has at least one valid label: `bug`, `enhancement`, `refactoring`, `documentation`, `tooling`, and/or `dependencies`
-- [ ] PR has a milestone or the `qa/skip-qa` label
 - [ ] All commits are signed (see: [signing commits][1])
 
 [1]: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

.github/workflows/add-milestone.yml

@@ -0,0 +1,59 @@
+name: Add Milestone on a Merged PR
+
+on:
+  pull_request:
+    types:
+      - closed
+    branches:
+      - main
+      - "v[0-9]+.[0-9]+"
+
+permissions: {}
+
+jobs:
+  add-milestone-pr:
+    name: Add Milestone on PR
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      GH_REPO: ${{ github.repository }}
+    steps:
+      - name: Get current milestone from branch
+        id: current-milestone
+        run: |
+          BASE_BRANCH="${{ github.base_ref }}"
+
+          if [[ "$BASE_BRANCH" == "main" ]]; then
+            # For main, use the open milestone with the highest creation order (latest upcoming release).
+            MILESTONE=$(gh api repos/${{ github.repository }}/milestones \
+              --jq '[.[] | select(.state == "open")] | sort_by(.number) | last | .title')
+          elif [[ "$BASE_BRANCH" =~ ^v([0-9]+)\.([0-9]+)$ ]]; then
+            # For release branches like v1.25, derive the milestone as v1.25.0.
+            MILESTONE="v${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.0"
+          else
+            echo "Error: Unexpected branch '$BASE_BRANCH'."
+            exit 1
+          fi
+
+          if [ -z "$MILESTONE" ]; then
+            echo "Error: Couldn't determine a current milestone for branch '$BASE_BRANCH'."
+            exit 1
+          fi
+
+          if [[ ! $MILESTONE =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "Error: Malformed milestone '$MILESTONE'. It should be of the form 'vX.Y.Z'."
+            exit 1
+          fi
+
+          echo "MILESTONE=$MILESTONE" >> "$GITHUB_OUTPUT"
+
+      - name: Set the merged PR milestone to current milestone
+        run: |
+          echo "Setting milestone $MILESTONE to PR $NUMBER."
+          gh issue edit "$NUMBER" --milestone "$MILESTONE"
+        env:
+          NUMBER: ${{ github.event.number }}
+          MILESTONE: ${{ steps.current-milestone.outputs.MILESTONE }}

.github/workflows/pr-linter.yml

@@ -3,7 +3,7 @@ on:
   pull_request_target:
     types: [opened, labeled, unlabeled, synchronize]
   pull_request:
-    types: [opened, labeled, unlabeled, synchronize, milestoned, demilestoned]
+    types: [opened, labeled, unlabeled, synchronize]
 
 permissions: {}
 
@@ -24,21 +24,3 @@ jobs:
         valid-labels: 'bug, enhancement, refactoring, documentation, tooling, dependencies'
         pull-request-number: '${{ github.event.pull_request.number }}'
         disable-reviews: true
-  check-milestone:
-    name: Check Milestone
-    if: github.event_name == 'pull_request'
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: read
-    steps:
-      - name: Check milestone and labels
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          PR_JSON=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }})
-          MILESTONE=$(echo "$PR_JSON" | jq -r '.milestone.title // empty')
-          HAS_SKIP_QA=$(echo "$PR_JSON" | jq -r '[.labels[].name] | any(. == "qa/skip-qa")')
-          if [ -z "$MILESTONE" ] && [ "$HAS_SKIP_QA" != "true" ]; then
-            echo "::error::Missing milestone or \`qa/skip-qa\` label"
-            exit 1
-          fi