chore: cleanup actions and allow reuse + pr template (#1637)

* cleanup actions and allow reuse

* add PR template

.github/workflows/partial-builder.yml

@@ -0,0 +1,48 @@
+name: Build Containers
+
+on:
+  workflow_call:
+    inputs:
+      tag:
+        required: true
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v1
+        with:
+          image: tonistiigi/binfmt:latest
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          install: true
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build Backend Image
+        run: |
+          docker build --push --no-cache \
+            --tag hkotel/mealie:api-${{ inputs.tag }}  \
+            --build-arg COMMIT=$(git rev-parse HEAD) \
+            --platform linux/amd64,linux/arm64 .
+
+      - name: Build Frontend Image
+        working-directory: "frontend"
+        run: |
+          docker build --push --no-cache \
+            --tag hkotel/mealie:frontend-${{ inputs.tag }} \
+            --platform linux/amd64,linux/arm64 .