Refactor workflows: build images on PRs, deploy after successful builds

Co-authored-by: PhantomDave <34485699+PhantomDave@users.noreply.github.com>

Author: Copilot

.github/workflows/build-backend-image.yml

@@ -9,6 +9,14 @@ on:
       - 'PhantomDave.BankTracking.Library/**'
       - 'Dockerfile'
       - '.github/workflows/build-backend-image.yml'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'PhantomDave.BankTracking.Api/**'
+      - 'PhantomDave.BankTracking.Data/**'
+      - 'PhantomDave.BankTracking.Library/**'
+      - 'Dockerfile'
+      - '.github/workflows/build-backend-image.yml'
   workflow_dispatch:
 
 env:
@@ -28,6 +36,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -49,6 +58,6 @@ jobs:
         with:
           context: .
           file: ./Dockerfile
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

.github/workflows/build-frontend-image.yml

@@ -6,6 +6,11 @@ on:
     paths:
       - 'frontend/**'
       - '.github/workflows/build-frontend-image.yml'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/build-frontend-image.yml'
   workflow_dispatch:
 
 env:
@@ -78,6 +83,7 @@ jobs:
           path: frontend
 
       - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -99,6 +105,6 @@ jobs:
         with:
           context: ./frontend
           file: ./frontend/Dockerfile
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

.github/workflows/deploy-tailscale.yml

@@ -1,7 +1,10 @@
 name: Deploy via Tailscale
 
 on:
-  push:
+  workflow_run:
+    workflows: ["Build and Push Backend Image", "Build and Push Frontend Image"]
+    types:
+      - completed
     branches: [main]
   workflow_dispatch:
 
@@ -16,6 +19,7 @@ jobs:
   deploy:
     name: Deploy to Production
     runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' || github.event_name == 'workflow_dispatch' }}
     permissions:
       contents: read
       packages: read