feat: Use caching in pipeline

.gitignore

@@ -64,3 +64,6 @@ legalconsenthub/.api-client-middleware
 ### TestContainers persistent data ###
 legalconsenthub-backend/postgres-data/
 
+### Docker BuildKit cache ###
+.buildx-cache/
+

pipeline.sh

@@ -155,6 +155,8 @@ frontend_job() {
             --tag "gitea.lugnas.de/denis/legalconsenthub:latest" \
             --tag "gitea.lugnas.de/denis/legalconsenthub:$GIT_SHA" \
             --file ./Dockerfile \
+            --cache-from type=local,src="$SCRIPT_DIR/.buildx-cache/frontend" \
+            --cache-to type=local,dest="$SCRIPT_DIR/.buildx-cache/frontend",mode=max \
             --push \
             ..
         if [ $? -ne 0 ]; then
@@ -209,11 +211,14 @@ backend_job() {
         log_success "Tests passed"
 
         log_info "Building Docker image..."
+        mkdir -p "$SCRIPT_DIR/.buildx-cache/backend"
         docker buildx build \
             --platform linux/amd64 \
             --tag "gitea.lugnas.de/denis/legalconsenthub-backend:latest" \
             --tag "gitea.lugnas.de/denis/legalconsenthub-backend:$GIT_SHA" \
             --file ./Dockerfile \
+            --cache-from type=local,src="$SCRIPT_DIR/.buildx-cache/backend" \
+            --cache-to type=local,dest="$SCRIPT_DIR/.buildx-cache/backend",mode=max \
             --push \
             ..
         if [ $? -ne 0 ]; then