hack(test): opt to avoid building the integration tests image

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Author: crazy-max

hack/test

@@ -8,6 +8,8 @@ set -eu -o pipefail
 : "${HTTPS_PROXY=}"
 : "${NO_PROXY=}"
 
+: "${TEST_IMAGE_BUILD=1}"
+: "${TEST_IMAGE_ID=buildkit-tests}"
 : "${TEST_INTEGRATION=}"
 : "${TEST_GATEWAY=}"
 : "${TEST_DOCKERFILE=}"
@@ -57,9 +59,6 @@ while test $# -gt 0; do
   shift
 done
 
-iid="buildkit-tests"
-iidfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
-
 testReportsDir="$(pwd)/bin/testreports"
 mkdir -p "$testReportsDir"
 testReportsVol="-v $testReportsDir:/testreports"
@@ -76,18 +75,20 @@ if [[ "$GOBUILDFLAGS" == *"-race"* ]]; then
   export VERIFYFLAGS="" # prevent -static verification
 fi
 
-buildxCmd build $cacheFromFlags \
-  --build-arg GO_VERSION \
-  --build-arg BUILDKITD_TAGS \
-  --build-arg HTTP_PROXY \
-  --build-arg HTTPS_PROXY \
-  --build-arg NO_PROXY \
-  --build-arg GOBUILDFLAGS \
-  --build-arg VERIFYFLAGS \
-  --build-arg CGO_ENABLED \
-  --target "integration-tests" \
-  --output "type=docker,name=$iid" \
-  $currentcontext
+if [ "$TEST_IMAGE_BUILD" = "1" ]; then
+  buildxCmd build $cacheFromFlags \
+    --build-arg GO_VERSION \
+    --build-arg BUILDKITD_TAGS \
+    --build-arg HTTP_PROXY \
+    --build-arg HTTPS_PROXY \
+    --build-arg NO_PROXY \
+    --build-arg GOBUILDFLAGS \
+    --build-arg VERIFYFLAGS \
+    --build-arg CGO_ENABLED \
+    --target "integration-tests" \
+    --output "type=docker,name=$TEST_IMAGE_ID" \
+    $currentcontext
+fi
 
 cacheVolume="buildkit-test-cache"
 if ! docker container inspect "$cacheVolume" >/dev/null 2>/dev/null; then
@@ -98,7 +99,7 @@ if [ "$TEST_KEEP_CACHE" != "1" ]; then
 fi
 
 if [ "$TEST_INTEGRATION" == 1 ]; then
-  cid=$(docker create --rm -v /tmp $testReportsVol --volumes-from=$cacheVolume -e CGO_ENABLED -e GITHUB_REF -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e TEST_DOCKERD -e SKIP_INTEGRATION_TESTS -e BUILDKIT_TEST_ENABLE_FEATURES -e BUILDKIT_TEST_DISABLE_FEATURES -e GOTESTSUM_FORMAT ${BUILDKIT_INTEGRATION_SNAPSHOTTER:+"-eBUILDKIT_INTEGRATION_SNAPSHOTTER"} -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry -e BUILDKIT_INTEGRATION_DOCKERD_FLAGS -e GORACE --privileged $iid gotestsum $gotestsumArgs --packages="${TESTPKGS:-./...}" -- $gotestArgs ${TESTFLAGS:--v})
+  cid=$(docker create --rm -v /tmp $testReportsVol --volumes-from=$cacheVolume -e CGO_ENABLED -e GITHUB_REF -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e TEST_DOCKERD -e SKIP_INTEGRATION_TESTS -e BUILDKIT_TEST_ENABLE_FEATURES -e BUILDKIT_TEST_DISABLE_FEATURES -e GOTESTSUM_FORMAT ${BUILDKIT_INTEGRATION_SNAPSHOTTER:+"-eBUILDKIT_INTEGRATION_SNAPSHOTTER"} -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry -e BUILDKIT_INTEGRATION_DOCKERD_FLAGS -e GORACE --privileged $TEST_IMAGE_ID gotestsum $gotestsumArgs --packages="${TESTPKGS:-./...}" -- $gotestArgs ${TESTFLAGS:--v})
   if [ "$TEST_DOCKERD" = "1" ]; then
     docker cp "$TEST_DOCKERD_BINARY" $cid:/usr/bin/dockerd
   fi
@@ -107,8 +108,8 @@ fi
 
 if [ "$TEST_GATEWAY" == 1 ]; then
   # Build-test "github.com/moby/buildkit/frontend/gateway/client", which isn't otherwise built by CI
-  # It really only needs buildkit-base. We have integration-tests in $iid, which is a direct child of buildkit-base.
-  cid=$(docker create --rm --volumes-from=$cacheVolume --entrypoint="" $iid go build -v ./frontend/gateway/client)
+  # It really only needs buildkit-base. We have integration-tests in $TEST_IMAGE_ID, which is a direct child of buildkit-base.
+  cid=$(docker create --rm --volumes-from=$cacheVolume --entrypoint="" $TEST_IMAGE_ID go build -v ./frontend/gateway/client)
   docker start -a $cid
 fi
 
@@ -138,8 +139,7 @@ if [ "$TEST_DOCKERFILE" == 1 ]; then
 
     if [ -s $tarout ]; then
       if [ "$release" = "mainline" ] || [ "$release" = "labs" ] || [ -n "$DOCKERFILE_RELEASES_CUSTOM" ] || [ "$GITHUB_ACTIONS" = "true" ]; then
-        cid=$(docker create -v /tmp $testReportsVol --rm --privileged --volumes-from=$cacheVolume -e CGO_ENABLED -e GITHUB_REF -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e TEST_DOCKERD -e BUILDKIT_TEST_ENABLE_FEATURES -e BUILDKIT_TEST_DISABLE_FEATURES -e GOTESTSUM_FORMAT -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry -e BUILDKIT_WORKER_RANDOM -e BUILDKIT_INTEGRATION_DOCKERD_FLAGS -e FRONTEND_GATEWAY_ONLY=local:/$release.tar -e EXTERNAL_DF_FRONTEND=/dockerfile-frontend -e GORACE $iid gotestsum $gotestsumArgs --packages=./frontend/dockerfile -- $gotestArgs --count=1 -tags "$buildtags" ${TESTFLAGS:--v})
-        docker cp $tarout $cid:/$release.tar
+        cid=$(docker create -v /tmp $testReportsVol --rm --privileged --volumes-from=$cacheVolume -e CGO_ENABLED -e GITHUB_REF -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e TEST_DOCKERD -e BUILDKIT_TEST_ENABLE_FEATURES -e BUILDKIT_TEST_DISABLE_FEATURES -e GOTESTSUM_FORMAT -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry -e BUILDKIT_WORKER_RANDOM -e BUILDKIT_INTEGRATION_DOCKERD_FLAGS -e FRONTEND_GATEWAY_ONLY=local:/$release.tar -e EXTERNAL_DF_FRONTEND=/dockerfile-frontend -e GORACE $TEST_IMAGE_ID gotestsum $gotestsumArgs --packages=./frontend/dockerfile -- $gotestArgs --count=1 -tags "$buildtags" ${TESTFLAGS:--v})
         if [ "$TEST_DOCKERD" = "1" ]; then
           docker cp "$TEST_DOCKERD_BINARY" $cid:/usr/bin/dockerd
         fi