Update build.yml (#13)

Author: nefertitirogers

build.yml

@@ -5,4 +5,6 @@ phases:
       - docker login -u AWS -p $(aws ecr get-login-password --region $AWS_REGION) $ECR_ENDPOINT
       - docker build -t builtimage .
       - docker tag builtimage:latest $ECR_IMAGE_URL:latest
-      - docker push $ECR_IMAGE_URL:latest
+      - docker tag builtimage:latest $ECR_IMAGE_URL:$(git rev-parse HEAD)
+      - docker push $ECR_IMAGE_URL:latest
+      - docker push $ECR_IMAGE_URL:$(git rev-parse HEAD)