docker/ci: Dont load default image on main commit (#279)

Signed-off-by: Ryan Northey <[email protected]>

Author: phlax

.github/workflows/_build_image.yml

@@ -85,6 +85,7 @@ jobs:
         OS_DISTRO: ${{ inputs.distro }}
         PUSH_GCR_IMAGE: ${{ inputs.gcr_push }}
         GCR_IMAGE_NAME: ${{ inputs.gcr_name }}
+        LOAD_IMAGE: ${{ github.event_name == 'pull_request' && 'true' || 'false' }}
     - name: Set up Go
       uses: actions/setup-go@v4
       if: ${{ inputs.test_toolchain }}

docker/linux/build.sh

@@ -69,5 +69,7 @@ if [[ -n "${IMAGE_TAGS}" ]]; then
     done
 fi
 
-# Testing after push to save CI time because this invalidates arm64 cache
-ci_log_run docker buildx build . -f "${OS_DISTRO}/Dockerfile" -t "${IMAGE_NAME}:${CONTAINER_TAG}" --platform "linux/amd64" --load
+if [[ "$LOAD_IMAGE" == "true" ]]; then
+    # Testing after push to save CI time because this invalidates arm64 cache
+    ci_log_run docker buildx build . -f "${OS_DISTRO}/Dockerfile" -t "${IMAGE_NAME}:${CONTAINER_TAG}" --platform "linux/amd64" --load
+fi