Introduce an option to skip the tool cache (#718)

Closes #701

Author: sethvargo

.github/workflows/integration.yml

@@ -46,24 +46,28 @@ jobs:
         uses: './'
         with:
           skip_install: true
+          skip_tool_cache: true
 
       # Constraint installation
       - name: 'Install constraint'
         uses: './'
         with:
           version: '>= 1.0.0'
+          skip_tool_cache: true
 
       # Default installation
       - name: 'Install version'
         uses: './'
         with:
           version: '374.0.0'
+          skip_tool_cache: true
 
       # Latest installation
       - name: 'Install latest'
         uses: './'
         with:
           version: 'latest'
+          skip_tool_cache: true
 
       # By default, there is no configuration
       - name: 'Check defaults'
@@ -77,6 +81,7 @@ jobs:
         uses: './'
         with:
           install_components: 'cloud-run-proxy'
+          skip_tool_cache: true
 
       - name: 'Check components'
         run: 'npm run integration'
@@ -88,6 +93,7 @@ jobs:
         uses: './'
         with:
           project_id: '${{ vars.PROJECT_ID }}'
+          skip_tool_cache: true
 
       - name: 'Check project ID'
         run: 'npm run integration'
@@ -103,6 +109,8 @@ jobs:
 
       - name: 'Setup gcloud with WIF'
         uses: './'
+        with:
+          skip_tool_cache: true
 
       - name: 'Check WIF authentication'
         run: 'npm run integration'
@@ -118,6 +126,8 @@ jobs:
 
       - name: 'Setup gcloud with SAKE'
         uses: './'
+        with:
+          skip_tool_cache: true
 
       - name: 'Check SAKE authentication'
         run: 'npm run integration'

action.yml

@@ -77,6 +77,18 @@ inputs:
     default: false
     required: false
 
+  skip_tool_cache:
+    description: |-
+      Skip transferring the downloaded artifacts into the runner's tool cache.
+      On GitHub-managed runners, this makes no difference since they are
+      ephemeral. On self-hosted runners, this controls whether the downloads are
+      cached stored on the disk.
+
+      For backwards-compatibility, this is is "false" by default. Setting the
+      value to "true" can significantly speed up installation times.
+    default: false
+    required: false
+
 outputs:
   version:
     description: |-