Fix black lint, fix /processing-runs 404s, add semantic release and GitOps deploy

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/3fdf6219-3e1f-4867-b74d-efb6e4fe7e72

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

.github/workflows/ci.yml

@@ -224,3 +224,59 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/arm64
+
+  # ── Phase 5: GitOps – update preprod k8s manifest ─────────────────────────
+  update-k8s-manifest:
+    name: Update Preprod K8s Manifest
+    runs-on: ubuntu-latest
+    needs: [build]
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    permissions:
+      contents: read
+
+    steps:
+      - name: Compute image tags
+        id: tag
+        run: |
+          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
+          echo "backend_image=ghcr.io/${{ github.repository_owner }}/inboxconverge/backend:main-${SHORT_SHA}" >> "$GITHUB_OUTPUT"
+          echo "frontend_image=ghcr.io/${{ github.repository_owner }}/inboxconverge/frontend:main-${SHORT_SHA}" >> "$GITHUB_OUTPUT"
+          echo "short_sha=${SHORT_SHA}" >> "$GITHUB_OUTPUT"
+
+      - name: Checkout k8s-cluster-state
+        uses: actions/checkout@v4
+        with:
+          repository: christianlouis/k8s-cluster-state
+          token: ${{ secrets.GH_PAT }}
+          path: k8s-cluster-state
+
+      - name: Update backend image tag in preprod manifest
+        uses: mikefarah/yq@v4.44.6
+        env:
+          IMAGE: ${{ steps.tag.outputs.backend_image }}
+        with:
+          cmd: |
+            yq -i '(.. | select(tag == "!!str") | select(test("^ghcr\\.io/christianlouis/inboxconverge/backend:"))) = strenv(IMAGE)' \
+              k8s-cluster-state/apps/gmail-puller/preprod/gmail-puller-stack.yaml
+
+      - name: Update frontend image tag in preprod manifest
+        uses: mikefarah/yq@v4.44.6
+        env:
+          IMAGE: ${{ steps.tag.outputs.frontend_image }}
+        with:
+          cmd: |
+            yq -i '(.. | select(tag == "!!str") | select(test("^ghcr\\.io/christianlouis/inboxconverge/frontend:"))) = strenv(IMAGE)' \
+              k8s-cluster-state/apps/gmail-puller/preprod/gmail-puller-stack.yaml
+
+      - name: Commit and push manifest update
+        run: |
+          cd k8s-cluster-state
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add apps/gmail-puller/preprod/gmail-puller-stack.yaml
+          if git diff --staged --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "chore(preprod): update inboxconverge images to ${{ steps.tag.outputs.short_sha }}"
+            git push
+          fi