make registry auth optional, must specify location

Signed-off-by: Jason Hall <jason@chainguard.dev>

.github/workflows/test-action.yaml

@@ -34,5 +34,9 @@ jobs:
           project:  imjasonh-autopilot
           location: us-east1
           cluster:  autopilot
-
+          registry_location: us-east1
       - run: kubectl get pods
+
+      - uses: imjasonh/setup-crane@main
+      - run: crane catalog us-east1-docker.pkg.dev
+

.github/workflows/using-gcloud.yaml

@@ -24,8 +24,12 @@ jobs:
       - uses: google-github-actions/setup-gcloud@98ddc00a17442e89a24bbf282954a3b65ce6d200 # v2.1.0
         with:
           project_id: imjasonh-autopilot
+          install_components: gke-gcloud-auth-plugin
       - run: |
           gcloud container clusters get-credentials autopilot \
               --region us-east1
 
       - run: kubectl get pods
+
+      - run: gcloud auth configure-docker us-east1-docker.pkg.dev
+      - run: crane catalog us-east1-docker.pkg.dev

README.md

@@ -48,12 +48,13 @@ This will set up a Docker credential helper for interacting with `[REGION]-docke
 
 This is similar to [`docker-credential-gcr`](https://github.com/GoogleCloudPlatform/docker-credential-gcr) except much simpler.
 
-This is configured by default when using the GitHub Action. You can disable this behavior with:
+This can also be configured with the GitHub Action:
 
-```
+```yaml
 uses: imjasonh/gke-auth@XYZ
 with:
-  configure-docker: false
+  location: us-central1-a
+  registry_location: us-central1
 ```
 
 ### Why?

action.yaml

@@ -17,10 +17,10 @@ inputs:
   cluster:
     description: "Name of the cluster"
     required: true
-  configure-docker:
-    description: "Set up Artifact Registry auth for the project and location"
-    required: true
-    default: "true"
+  registry_location:
+    description: "Region or multi-region of the Artifact Registry instance"
+    required: false
+    default: ""
 runs:
   using: "composite"
   steps:
@@ -29,7 +29,7 @@ runs:
       set -ex
 
       # Install gke-auth:
-      # - if version is "tip", install from tip of main.
+      # - if version is "tip", `go install` from tip of main.
       # - if version is "latest-release", look up latest release.
       # - otherwise, install the specified version.
       case ${{ inputs.version }} in
@@ -49,8 +49,8 @@ runs:
         curl -fsL https://github.com/imjasonh/gke-auth/releases/download/${tag}/gke-auth_${tag:1}_Linux_x86_64.tar.gz | sudo tar xzf - -C /usr/local/bin gke-auth
       fi
 
-      if [[ "${{ inputs.configure-docker }}" == "true" ]]; then
-        gke-auth --location=${{ inputs.location }} --configure-docker
+      if [[ "${{ inputs.registry_location }}" != "" ]]; then
+        gke-auth --location=${{ inputs.registry_location }} --configure-docker
       fi
 
       gke-auth --project=${{ inputs.project }} \

main.go

@@ -23,8 +23,8 @@ import (
 )
 
 var (
-	project     = flag.String("project", "", "Name of the project (empty means look it up)")
-	location    = flag.String("location", "", "Location of the cluster (empty means look it up)")
+	project     = flag.String("project", "", "Name of the project")
+	location    = flag.String("location", "", "Location of the cluster")
 	clusterName = flag.String("cluster", "", "Name of the cluster")
 
 	get             = flag.Bool("get", false, "If true, print auth information")