fix gcloud builds

Signed-off-by: James Strong <strong.james.e@gmail.com>

images/ext-auth-example-authsvc/Makefile

@@ -18,7 +18,9 @@ SHELL=/bin/bash -o pipefail -o errexit
 DIR:=$(strip $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST)))))
 INIT_BUILDX=$(DIR)/../../hack/init-buildx.sh
 
-TAG ?=v1.0.0
+SHORT_SHA ?=$(shell git rev-parse --short HEAD)
+TAG ?=v$(shell date +%Y%m%d)-$(SHORT_SHA)
+
 REGISTRY ?= local
 
 IMAGE = $(REGISTRY)/ext-auth-example-authsvc

images/ext-auth-example-authsvc/cloudbuild.yaml

@@ -8,8 +8,6 @@ steps:
     entrypoint: bash
     env:
       - DOCKER_CLI_EXPERIMENTAL=enabled
-      - SHORT_SHA=$SHORT_SHA
-      - BASE_REF=$_PULL_BASE_REF
       - REGISTRY=gcr.io/k8s-staging-ingress-nginx
       # default cloudbuild has HOME=/builder/home and docker buildx is in /root/.docker/cli-plugins/docker-buildx
       # set the home to /root explicitly to if using docker buildx
@@ -19,6 +17,3 @@ steps:
     - |
       gcloud auth configure-docker \
       && cd images/ext-auth-example-authsvc && make push
-substitutions:
-  _GIT_TAG: "12345"
-  _PULL_BASE_REF: "master"