Pull gcc build image from public ECR, bump version (aws#3108)

- Change dockerhub gcc image to public ecr
- gcc version 7.3.0 is not available on public ecr, so just bumped
  version to the latest version available
- Also removed the ci-ecr-pull/push scripts as these are no longer
  necessary, since we have no more dockerhub images in our build or test
  workflows.

Makefile

@@ -226,7 +226,6 @@ cni-plugins: get-cni-sources .out-stamp build-ecs-cni-plugins build-vpc-cni-plug
 
 .PHONY: codebuild
 codebuild: .out-stamp
-	./scripts/ci-ecr-pull "us-west-2" 508403128001
 	$(MAKE) release TARGET_OS="linux"
 	TARGET_OS="linux" ./scripts/local-save
 	$(MAKE) docker-release TARGET_OS="windows"

misc/pause-container/Dockerfile

@@ -10,7 +10,7 @@
 # on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 # express or implied. See the License for the specific language governing
 # permissions and limitations under the License.
-FROM gcc:7.3.0 as build
+FROM public.ecr.aws/docker/library/gcc:11.2.0 as build
 
 WORKDIR /src/
 ADD . /src/

scripts/ci-ecr-pull

@@ -15,49 +15,4 @@
 # limitations under the License.
 set -e
 
-dir=$(dirname "${BASH_SOURCE[0]}")
-source "$dir/ci-ecr"
-
-AWS_REGION="${1}"
-AWS_ACCOUNT_ID="${2}"
-
-usage() {
-    cat <<EOF
-Usage: ${0} AWS_REGION AWS_ACCOUNT_ID
-
-This script attempts to pull the following dockerhub images from ECR:
-
-$IMAGES
-
-It assumes that the ECR images will be formatted like:
-
-AWS_ACCOUNT_ID.dkr.ecr.AWS_REGION.amazonaws.com/ci/IMAGE_OS/IMAGE_ARCH/IMAGE_NAME
-
-(see ci-ecr-push for creating these)
-EOF
-}
-
-if [ -z "$AWS_REGION" ]; then
-    usage
-    exit 1
-fi
-
-if [ -z "$AWS_ACCOUNT_ID" ]; then
-    usage
-    exit 1
-fi
-
-ECR_URI="${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_REGION}.amazonaws.com"
-
-aws --region "$AWS_REGION" ecr get-login-password | docker login --username AWS --password-stdin "$ECR_URI"
-
-for image in $IMAGES; do
-    imageArch=$(docker version --format "{{.Server.Arch}}")
-    imageOS=$(docker version --format "{{.Server.Os}}")
-    fullRepoName="ci/$imageOS/$imageArch/$image"
-    fullURI="$ECR_URI/$fullRepoName"
-    echo "PULLING: $fullURI"
-    # ignore errors if repo doesnt exist or pull fails (fallback to dockerhub)
-    docker pull "$fullURI" || continue
-    docker tag "$fullURI" "$image"
-done
+exit 0