Update docker build (#3)

This copies the docker build script from dockernetes, and changes the name of the docker image from flytetools to just swagger-codegen-cli.

flytetools/swagger-codegen-cli/Makefile

@@ -1,4 +1,5 @@
+export REPOSITORY=swagger-codegen-cli
+
 .PHONY: docker_build
 docker_build:
-	@docker build -f swagger-codegen-cli/Dockerfile --tag docker.io/lyft/flytetools:swagger-codegen-cli swagger-codegen-cli
-
+	IMAGE_NAME=$$REPOSITORY ./docker_build.sh

flytetools/swagger-codegen-cli/docker_build.sh

@@ -0,0 +1,50 @@
+set -e
+
+echo ""
+echo "------------------------------------"
+echo "          DOCKER BUILD"
+echo "------------------------------------"
+echo ""
+
+GIT_SHA=$(git rev-parse HEAD)
+RELEASE_SEMVER=$(git describe --tags --exact-match "$GIT_SHA" 2>/dev/null) || true
+
+if [ -n "$REGISTRY" ]; then
+  # Do not push if there are unstaged git changes
+  CHANGED=$(git status --porcelain)
+  if [ -n "$CHANGED" ]; then
+    echo "Please commit git changes before pushing to a registry"
+    exit 1
+  fi
+fi
+
+docker build -t "$IMAGE_NAME:latest" .
+echo "$IMAGE_NAME:latest built locally."
+
+
+if [ -n "$REGISTRY" ]; then
+
+  if [ -n "${DOCKER_REGISTRY_PASSWORD}" ]; then
+    docker login --username="$DOCKER_REGISTRY_USERNAME" --password="$DOCKER_REGISTRY_PASSWORD"
+  fi
+
+  SHA_IMAGE_TAG="${REGISTRY}/${IMAGE_NAME}:${GIT_SHA}"
+
+  docker tag "${IMAGE_NAME}:latest" "$SHA_IMAGE_TAG"
+
+  docker push "$SHA_IMAGE_TAG"
+  echo "${SHA_IMAGE_TAG} pushed to remote"
+
+  if [ -n "$RELEASE_SEMVER" ]; then
+
+    SEMVER_IMAGE_TAG="${REGISTRY}/${IMAGE_NAME}:${RELEASE_SEMVER}"
+
+    docker tag "${IMAGE_NAME}:latest" "$SEMVER_IMAGE_TAG"
+    docker push "$SEMVER_IMAGE_TAG"
+    echo "${SEMVER_IMAGE_TAG} pushed to remote"
+  fi
+
+fi
+
+echo ""
+echo "success"