Add workflows for building and pushing observability components: Alloy, Grafana, Loki, and Prometheus

.gitea/workflows/action-build-and-push.yaml

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+name: Docker Build & Push to GitHub Container Registry (Use git tags with format vX.Y.Z as release version)
+
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        type: string
+        required: true
+        description: >
+          Docker image name without registry and owner.
+          Example: observability/alloy
+
+      build_context:
+        type: string
+        required: false
+        default: .
+        description: >
+          Path to the Docker build context.
+          Example: . or ./services/api
+
+      file_path:
+        type: string
+        required: false
+        default: ./Dockerfile
+        description: >
+          Path to the Dockerfile relative to the repository root.
+          Example: ./Dockerfile or ./services/api/Dockerfile
+
+      platforms:
+        type: string
+        required: false
+        default: linux/amd64,linux/arm64
+        description: >
+          Comma-separated list of target platforms to build.
+          Example: linux/amd64,linux/arm64
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU (for cross-arch builds)
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Ensure lowercase username because some registries do not allow uppercase letters
+        id: lowercase
+        run: echo "username=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ steps.lowercase.outputs.username }}/${{ inputs.image_name }}
+          tags: |
+            type=match,pattern=.*(v\d+\.\d+\.\d+),group=1
+            type=match,pattern=.*(v\d+\.\d+)\.\d+,group=1
+            type=match,pattern=.*(v\d+)\.\d+\.\d+,group=1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ${{ inputs.build_context }}
+          file: ${{ inputs.file_path }}
+          platforms: ${{ inputs.platforms }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitea/workflows/b&p-observability-alloy.yaml

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+name: Build and Push Alloy
+
+on:
+  push:
+    tags:
+      - "alloy-v*.*.*"
+
+jobs:
+  build-and-push:
+    uses: ./.github/workflows/action-build-and-push.yaml
+    permissions:
+      contents: read
+      packages: write
+    with:
+      image_name: observability/alloy
+      build_context: ./observability/alloy
+      file_path: ./observability/alloy/Dockerfile

.gitea/workflows/b&p-observability-grafana.yaml

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+name: Build and Push Grafana Observability
+
+on:
+  push:
+    tags:
+      - "grafana-v*.*.*"
+
+jobs:
+  build-and-push:
+    uses: ./.github/workflows/action-build-and-push.yaml
+    permissions:
+      contents: read
+      packages: write
+    with:
+      image_name: observability/grafana
+      build_context: ./observability/grafana
+      file_path: ./observability/grafana/Dockerfile

.gitea/workflows/b&p-observability-loki.yaml

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+name: Build and Push Loki Database
+
+on:
+  push:
+    tags:
+      - "loki-v*.*.*"
+
+jobs:
+  build-and-push:
+    uses: ./.github/workflows/action-build-and-push.yaml
+    permissions:
+      contents: read
+      packages: write
+    with:
+      image_name: observability/loki
+      build_context: ./observability/loki
+      file_path: ./observability/loki/Dockerfile

.gitea/workflows/b&p-observability-prometheus.yaml

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+name: Build and Push Prometheus Observability
+
+on:
+  push:
+    tags:
+      - "prometheus-v*.*.*"
+
+jobs:
+  build-and-push:
+    uses: ./.github/workflows/action-build-and-push.yaml
+    permissions:
+      contents: read
+      packages: write
+    with:
+      image_name: observability/prometheus
+      build_context: ./observability/prometheus
+      file_path: ./observability/prometheus/Dockerfile