Use alpine as base images. (#1033)

.github/workflows/build.yml

@@ -1,14 +1,15 @@
 name: Docker builds
 
 on:
-  pull_request:
-    branches: [master]
   push:
     branches: [master]
     tags:
       - v*
+  pull_request:
+    branches: [master]
 
 env:
+  IS_PUSHING_IMAGES: ${{ github.event_name != 'pull_request' && github.repository == 'photoview/photoview' }}
   DOCKER_USERNAME: viktorstrate
   DOCKER_IMAGE: viktorstrate/photoview
   DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
@@ -20,9 +21,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Delete huge unnecessary tools folder
-        run: rm -rf /opt/hostedtoolcache
-
       - name: Checkout
         uses: actions/checkout@v4
 
@@ -36,7 +34,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Docker Login
-        if: success() && github.event_name != 'pull_request' && github.repository == 'photoview/photoview'
+        if: ${{ env.IS_PUSHING_IMAGES == 'true' }}
         uses: docker/login-action@v3
         with:
           username: ${{ env.DOCKER_USERNAME }}
@@ -64,7 +62,7 @@ jobs:
           context: .
           platforms: ${{ env.PLATFORMS }}
           pull: true
-          push: ${{ github.event_name != 'pull_request' && github.repository == 'photoview/photoview' }}
+          push: ${{ env.IS_PUSHING_IMAGES }}
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}
           cache-from: type=gha