fix: use docker volumes to share context between containers

.gitea/workflows/build-images.yml

@@ -83,26 +83,37 @@ jobs:
           IMAGE_NAME="${{ env.REGISTRY }}/damien/${{ matrix.image }}"
           
           echo "Building ${IMAGE_NAME}:latest ..."
-          echo "Context: /src/images/${{ matrix.image }}"
           
-          # Create auth config for buildkit
-          mkdir -p /root/.docker
+          # Create a unique volume name for this build
+          VOLUME_NAME="buildkit-ctx-$$"
+          
+          # Create a docker volume and copy source into it
+          docker volume create ${VOLUME_NAME}
+          docker run --rm -v ${VOLUME_NAME}:/context -v /src/images/${{ matrix.image }}:/src:ro alpine sh -c "cp -r /src/* /context/"
+          
+          # Create auth config in another volume
+          AUTH_VOLUME="buildkit-auth-$$"
+          docker volume create ${AUTH_VOLUME}
           AUTH=$(echo -n "${REGISTRY_USER}:${REGISTRY_TOKEN}" | base64 | tr -d '\n')
-          cat > /root/.docker/config.json <<EOF
+          docker run --rm -v ${AUTH_VOLUME}:/auth alpine sh -c "mkdir -p /auth && cat > /auth/config.json << 'AUTHEOF'
           {
-            "auths": {
-              "${{ env.REGISTRY }}": {
-                "auth": "${AUTH}"
+            \"auths\": {
+              \"${{ env.REGISTRY }}\": {
+                \"auth\": \"${AUTH}\"
               }
             }
           }
-          EOF
+          AUTHEOF"
           
-          # Run buildkit in daemonless mode via docker socket
+          # Debug: show context content
+          echo "Context content:"
+          docker run --rm -v ${VOLUME_NAME}:/context alpine ls -la /context/
+          
+          # Run buildkit in daemonless mode
           docker run --rm \
             --privileged \
-            -v /src/images/${{ matrix.image }}:/context:ro \
-            -v /root/.docker/config.json:/root/.docker/config.json:ro \
+            -v ${VOLUME_NAME}:/context:ro \
+            -v ${AUTH_VOLUME}:/root/.docker:ro \
             --entrypoint buildctl-daemonless.sh \
             moby/buildkit:master \
               build \
@@ -111,4 +122,7 @@ jobs:
               --local dockerfile=/context \
               --output type=image,name=${IMAGE_NAME}:latest,push=true
           
+          # Cleanup volumes
+          docker volume rm ${VOLUME_NAME} ${AUTH_VOLUME} || true
+          
           echo "✅ Pushed ${IMAGE_NAME}:latest"