feat: Added GCP authentication step for tf-checks (#103)

.github/workflows/tf-checks.yml

@@ -19,13 +19,22 @@ on:
         required: false
         default: false
         type: string
+      gcp_credentials:
+        description: 'GCP credentials to use.'
+        required: false
+        default: false
+        type: string
     secrets:
       AWS_ACCESS_KEY_ID:
         description: 'aws access keys'
         required: false
       AWS_SECRET_ACCESS_KEY:
         description: 'aws secret access keys'
         required: false
+      GCP_CREDENTIALS:
+        description: 'The Google Cloud JSON service account key to use for authentication'
+        required: false
+
 
 jobs:
   # - Terraform version extract as output.
@@ -74,6 +83,12 @@ jobs:
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
           aws-region: us-east-1
 
+      - name: 'Authenticate to Google Cloud'
+        if: ${{ inputs.gcp_credentials == 'true' }}
+        uses: 'google-github-actions/auth@v1'
+        with:
+          credentials_json: '${{ secrets.GCP_CREDENTIALS }}'
+
       # - Installing terraform version based on version extract.
       - name: Install Terraform v${{ inputs.terraform_version || needs.versionExtract.outputs.maxVersion }}
         uses: hashicorp/setup-terraform@v3