fix: close #6 - find and build all Dockerfiles in subdirectories

CI docker-build job only checked root Dockerfile, but all
Dockerfiles live in subdirs (scraper/, articleServer/, etc.).
Now uses find to locate all Dockerfile/dockerfile variants
and builds each in its directory context.

.gitea/workflows/ci.yml

@@ -92,13 +92,27 @@ jobs:
           git clone --depth 1 $GITEA_URL/$GITHUB_REPOSITORY $GITHUB_WORKSPACE
           git -C $GITHUB_WORKSPACE checkout $GITHUB_SHA 2>/dev/null || true
 
-      - name: Build Docker image
+      - name: Build Docker images
         if: always()
         run: |
-          if [[ -f Dockerfile ]]; then
-            docker build -t $GITHUB_REPOSITORY:test .
-          else
+          DOCKERFILES=$(find . -type f \( -name "Dockerfile" -o -name "dockerfile" \) 2>/dev/null)
+          if [ -z "$DOCKERFILES" ]; then
             echo "No Dockerfile found, skipping docker build"
+          else
+            echo "Found Dockerfiles:"
+            echo "$DOCKERFILES"
+            FAIL=0
+            while IFS= read -r df; do
+              DIR=$(dirname "$df")
+              NAME=$(basename "$DIR")
+              echo "Building $DIR/dockerfile as ${NAME}:test..."
+              docker build -t "${NAME}:test" "$DIR/" || FAIL=1
+            done <<< "$DOCKERFILES"
+            if [ $FAIL -ne 0 ]; then
+              echo "One or more Docker builds failed"
+              exit 1
+            fi
+            echo "All Docker images built successfully"
           fi
 
   security: