build: prep github actions builds

.github/workflows/build-docker.yml

@@ -0,0 +1,54 @@
+name: Docker Image CI
+
+on:
+    push:
+        branches:
+            - 'main'
+            - 'master'
+            - 'trunk'
+        tags:
+            - 'v*'
+    pull_request:
+        branches:
+            - 'main'
+            - 'master'
+            - 'trunk'
+    workflow_dispatch:
+
+jobs:
+    build:
+        strategy:
+            matrix:
+                component: [backend, frontend, webhooker]
+
+        runs-on: ubuntu-latest
+
+        env:
+            DOCKERHUB_TEMPLATE: ${{ vars.DOCKERHUB_TEMPLATE_PREFIX }}-${{ matrix.component }}
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+
+            - name: Docker meta
+              id: meta
+              uses: docker/metadata-action@v5
+              with:
+                  images: ${{ env.DOCKERHUB_TEMPLATE }}
+
+            - name: Login to DockerHub
+              if: github.event_name != 'pull_request'
+              uses: docker/login-action@v3
+              with:
+                  username: ${{ secrets.DOCKERHUB_USERNAME }}
+                  password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+            - name: Build and push - ${{ matrix.component }}
+              uses: docker/build-push-action@v5
+              with:
+                  context: .
+                  file: docker-compose/Dockerfile
+                  target: ${{ matrix.component }}
+                  push: ${{ github.event_name != 'pull_request' }}
+                  tags: ${{ steps.meta.outputs.tags }}, ${{ env.DOCKERHUB_TEMPLATE }}:latest
+                  labels: ${{ steps.meta.outputs.labels }}