Add support for custom gcloud components and versions (#291)

Fixes GH-270

README.md

@@ -77,6 +77,13 @@ jobs:
 
     See the [complete list of flags](https://cloud.google.com/sdk/gcloud/reference/run/deploy#FLAGS) for more information.
 
+---
+
+-   `gcloud_version`: (Optional) Version of the gcloud CLI to use. The default value is `latest`.
+
+-   `gcloud_component`: (Optional) Component of the gcloud CLI to use. Valid
+    values are `alpha` and `beta`. The default value is to use the stable track.
+
 ### app.yaml customizations
 
 Other application configurations can be customized through the app.yaml, ie the

action.yml

@@ -50,6 +50,21 @@ inputs:
       --service-account=my-account@project.iam.gserviceaccount.com --no-cache
     required: false
 
+  gcloud_version:
+    description: |-
+      Version of the Cloud SDK to install. If unspecified or set to "latest",
+      the latest available gcloud SDK version for the target platform will be
+      installed. Example: "290.0.1".
+    required: false
+
+  gcloud_component:
+    description: |-
+      Version of the Cloud SDK components to install and use. If unspecified,
+      the latest or released version will be used. This is the equivalent of
+      running 'gcloud alpha COMMAND' or 'gcloud beta COMMAND'. Valid values are
+      `alpha` or `beta`. The default value is to use the stable track.
+    required: false
+
 outputs:
   name:
     description: |-