Add repository_dispatch listening

Signed-off-by: Dimitar Dimitrov <[email protected]>

Author: dimitarvdimitrov

.github/workflows/update-vendored-mimir-prometheus.yml

@@ -14,6 +14,9 @@ on:
         default: 'main'
         type: string
 
+  repository_dispatch:
+    types: [ mimir-prometheus-branch-push ]
+
 permissions:
   contents: write
   pull-requests: write
@@ -22,10 +25,31 @@ jobs:
   update-mimir-prometheus:
     runs-on: ubuntu-latest
     steps:
+      - name: Determine branch names
+        id: branch-names
+        run: |
+          if [ "${{ github.event_name }}" = "repository_dispatch" ]; then
+            # For repository_dispatch, use the branch_name from client_payload for mimir_prometheus_branch.
+            # The main use case is for weekly branches, so we just use the same branch name here too.
+            MIMIR_PROMETHEUS_BRANCH="${{ github.event.client_payload.branch_name }}"
+            MIMIR_BRANCH=$MIMIR_PROMETHEUS_BRANCH
+            echo "Triggered by repository_dispatch"
+            echo "Using mimir-prometheus branch from payload: $MIMIR_PROMETHEUS_BRANCH"
+          else
+            # For workflow_dispatch, use the input values
+            MIMIR_BRANCH="${{ inputs.mimir_branch }}"
+            MIMIR_PROMETHEUS_BRANCH="${{ inputs.mimir_prometheus_branch }}"
+            echo "Triggered by workflow_dispatch"
+            echo "Using input values - mimir branch: $MIMIR_BRANCH, mimir-prometheus branch: $MIMIR_PROMETHEUS_BRANCH"
+          fi
+          
+          echo "mimir_branch=$MIMIR_BRANCH" >> $GITHUB_OUTPUT
+          echo "mimir_prometheus_branch=$MIMIR_PROMETHEUS_BRANCH" >> $GITHUB_OUTPUT
+
       - name: Check out repository
         uses: actions/checkout@v4
         with:
-          ref: ${{ inputs.mimir_branch }}
+          ref: ${{ steps.branch-names.outputs.mimir_branch }}
           token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
           set-safe-directory: '*'
@@ -60,7 +84,7 @@ jobs:
       - name: Get mimir-prometheus commit info
         id: get-commit-info
         env:
-          MIMIR_PROMETHEUS_BRANCH: ${{ inputs.mimir_prometheus_branch }}
+          MIMIR_PROMETHEUS_BRANCH: ${{ steps.branch-names.outputs.mimir_prometheus_branch }}
         run: |
           # Fetch the latest commit hash from the specified branch
           COMMIT_HASH=$(git ls-remote https://github.com/grafana/mimir-prometheus.git "${MIMIR_PROMETHEUS_BRANCH}" | cut -f1)
@@ -107,9 +131,10 @@ jobs:
             *This PR was automatically created by the [update-mimir-prometheus workflow](https://github.com/grafana/mimir/blob/main/.github/workflows/update-mimir-prometheus.yml)*
 
             ### Details:
-            - **Source branch/ref**: [`${{ inputs.mimir_prometheus_branch }}`](https://github.com/grafana/mimir-prometheus/tree/${{ inputs.mimir_prometheus_branch }})
+            - **Source branch/ref**: [`${{ steps.branch-names.outputs.mimir_prometheus_branch }}`](https://github.com/grafana/mimir-prometheus/tree/${{ steps.branch-names.outputs.mimir_prometheus_branch }})
             - **Commit hash**: [`${{ steps.get-commit-info.outputs.commit_hash }}`](https://github.com/grafana/mimir-prometheus/commit/${{ steps.get-commit-info.outputs.commit_hash }})
+            - **Trigger**: ${{ github.event_name }}
           commit-message: Update mimir-prometheus to `${{ steps.get-commit-info.outputs.short_hash }}`
-          branch: bot/${{ inputs.mimir_branch }}/update-mimir-prometheus-${{ steps.get-commit-info.outputs.short_hash }}-${{ steps.get-commit-info.outputs.timestamp }}
-          base: ${{ inputs.mimir_branch }}
+          branch: bot/${{ steps.branch-names.outputs.mimir_branch }}/update-mimir-prometheus-${{ steps.get-commit-info.outputs.short_hash }}-${{ steps.get-commit-info.outputs.timestamp }}
+          base: ${{ steps.branch-names.outputs.mimir_branch }}
           delete-branch: true