feat: add build on push action

Author: TimLohrer

.github/workflows/on-push.yml

@@ -0,0 +1,43 @@
+name: Test build on push
+
+on:
+  push: 
+    branches-ignore:
+      - master
+  pull_request:
+    branches:
+      - "**"
+
+jobs:
+  build-and-push:
+    runs-on: self-hosted
+
+    steps:
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Extract tag version
+      id: extract_tag
+      run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+    ### FRONTEND IMAGE ###
+    - name: Build Frontend Image
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        file: ./Dockerfile
+        build-args: |
+          VERSION=dev
+        tags: |
+          timlohrer/auth-rs-frontend:dev
+
+    ### BACKEND IMAGE ###
+    - name: Build Backend Image
+      uses: docker/build-push-action@v5
+      with:
+        context: ./backend
+        file: ./backend/Dockerfile
+        build-args: |
+          VERSION=${{ steps.extract_tag.outputs.VERSION }}
+        tags: |
+          timlohrer/auth-rs-backend:dev