ci: add admin workflow

.github/workflows/build-docker-admin.yml

@@ -0,0 +1,75 @@
+name: Admin - Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  admin-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/socstech/asgard-admin
+
+      - name: Build and Push Production Docker Image
+        id: build-and-push
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64
+          context: ./admin
+          file: ./admin/Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: |
+            ${{ steps.meta.outputs.tags }}
+            ghcr.io/socstech/asgard-admin:latest
+            ghcr.io/socstech/asgard-admin:${{ github.sha }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Build and Push Pull Request Docker Image
+        if: ${{ github.event_name == 'pull_request' }}
+        id: pr-build-and-push
+        uses: docker/build-push-action@v6
+        with:
+          platforms: linux/amd64
+          context: ./admin
+          file: ./admin/Dockerfile
+          push: true
+          tags: |
+            ghcr.io/socstech/asgard-admin:${{ github.sha }}
+            ghcr.io/socstech/asgard-admin:pr-${{ github.event.number }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            EXPIRE_AFTER=14d