Add Github workflow to update Alloy chart version

Signed-off-by: Michel Hollands <michel.hollands@gmail.com>

.github/configs/updatecli.d/alloy.yaml

@@ -0,0 +1,30 @@
+ame: Bump dependency "alloy" for Helm chart "meta-monitoring"
+sources:
+    alloy:
+        name: Get latest "alloy" Helm chart version
+        kind: helmchart
+        spec:
+            name: alloy
+            url: https://grafana.github.io/helm-charts
+            versionfilter:
+                kind: semver
+                pattern: '*'
+conditions:
+    alloy:
+        name: Ensure Helm chart dependency "alloy" is specified
+        kind: yaml
+        spec:
+            file: charts/meta-monitoring/Chart.yaml
+            key: $.dependencies[1].name
+            value: alloy
+        disablesourceinput: true
+targets:
+    alloy:
+        name: Bump Helm chart dependency "alloy" for Helm chart "meta-monitoring"
+        kind: helmchart
+        spec:
+            file: Chart.yaml
+            key: $.dependencies[1].version
+            name: charts/meta-monitoring
+            versionincrement: none
+        sourceid: alloy

.github/workflows/check-for-dependency-updates.yaml

@@ -0,0 +1,53 @@
+---
+name: Check for dependency updates
+
+on:
+    workflow_dispatch:
+    schedule:
+      # Run once a day
+      - cron: '0 0 * * *'
+
+permissions:
+    contents: "write"
+    pull-requests: "write"
+
+env:
+    UPDATECLI_CONFIG_DIR: "${{ github.workspace }}/.github/configs/updatecli.d"
+    UPDATECLI_GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+jobs:
+    updateGrafanaAlloy:
+        name: Update Grafana Alloy
+        runs-on: "ubuntu-latest"
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Install Updatecli
+              uses: updatecli/updatecli-action@v2
+
+            - name: Run Updatecli
+              id: update-grafana-alloy
+              run: |
+                updatecli apply --config ${UPDATECLI_CONFIG_DIR}/grafana-alloy.yaml
+                if ! git diff --exit-code > /dev/null; then
+                  echo "changed=true" >> "${GITHUB_OUTPUT}"
+                fi
+
+            - name: Install Helm
+              if: steps.update-grafana-alloy.outputs.changed == 'true'
+              uses: azure/setup-helm@v3
+
+            - name: Create pull request
+              if: steps.update-grafana-alloy.outputs.changed == 'true'
+              uses: peter-evans/create-pull-request@v5
+              with:
+                title: "[dependency] Update Grafana Alloy"
+                body: "Updates the Grafana Alloy subchart"
+                base: main
+                author: "${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>"
+                committer: "GitHub <noreply@github.com>"
+                commit-message: Update Grafana Alloy
+                labels: dependencies
+                branch: chore/update-grafana-alloy
+                delete-branch: true