try to move conditional path checking to a step in job so workflow ca…

…n always be a required status

Use 'if' for steps

.github/workflows/build_images_uv.yaml

@@ -1,46 +1,59 @@
 name: Docker image CI
 
 on:
-  pull_request:
-    paths:
-      - "lumigator/**"
-      - ".github/**"
-    # synchronized is when you push new commits
-    types: ["opened", "synchronize"]
   push:
     branches:
-      - main
+      - "main"
+  pull_request:
+    branches:
+      - "**"
   # required to enable manual triggers on the GH web ui
   workflow_dispatch:
 
 jobs:
-  build:
+  build-image:
     name: Build Docker image
     runs-on: ubuntu-latest
-
     steps:
-      - name: Checkout
+      - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check modified paths
+        run: |
+          if git diff --name-only ${{ github.event.before }} ${{ github.event.pull_request.head.sha }} | grep -E '^lumigator/|^\.github/'; then
+            echo "Changes detected. Rebuilding image..."
+            is_image_build_required=true
+          else
+            echo "No relevant changes detected."
+            is_image_build_required=false
+          fi
+          echo "is_image_build_required=$is_image_build_required" >> $GITHUB_OUTPUT
 
       - name: Get repo version
+        if: ${{ steps.vars.outputs.is_image_build_required }}
         run: |
           echo "REPOVERSION=$(git describe --tags --dirty --match \"[0-9\.]*\" --always)" >> $GITHUB_ENV
           echo "Version of the repo for this build: $REPOVERSION"
 
       - name: Set up QEMU
+        if: ${{ steps.vars.outputs.is_image_build_required }}
         uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker buildx
+        if: ${{ steps.vars.outputs.is_image_build_required }}
         uses: docker/setup-buildx-action@v3
 
       - name: Login to DockerHub
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        if: ${{ steps.vars.outputs.is_image_build_required && github.event_name == 'push' && github.ref == 'refs/heads/main' }}
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push
+        if: ${{ steps.vars.outputs.is_image_build_required }}
         uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm64