fix(action): correct quoting in workflow expressions

Corrects the quoting of GitHub Actions expressions in `action.yml`. The expression parser was failing when an expression contained single quotes while also being wrapped in single quotes.

This change switches to using double quotes to wrap expressions that contain single quotes, which resolves the parsing error and ensures the workflow functions correctly.

Author: jerop

action.yml

@@ -84,11 +84,11 @@ runs:
       shell: 'bash'
       run: '${{ github.action_path }}/scripts/validate-inputs.sh'
       env:
-        INPUT_GEMINI_API_KEY_PRESENT: '${{ inputs.gemini_api_key != '' }}'
-        INPUT_GOOGLE_API_KEY_PRESENT: '${{ inputs.google_api_key != '' }}'
-        INPUT_GCP_WORKLOAD_IDENTITY_PROVIDER_PRESENT: '${{ inputs.gcp_workload_identity_provider != '' }}'
-        INPUT_GCP_PROJECT_ID_PRESENT: '${{ inputs.gcp_project_id != '' }}'
-        INPUT_GCP_SERVICE_ACCOUNT_PRESENT: '${{ inputs.gcp_service_account != '' }}'
+        INPUT_GEMINI_API_KEY_PRESENT: "${{ inputs.gemini_api_key != '' }}"
+        INPUT_GOOGLE_API_KEY_PRESENT: "${{ inputs.google_api_key != '' }}"
+        INPUT_GCP_WORKLOAD_IDENTITY_PROVIDER_PRESENT: "${{ inputs.gcp_workload_identity_provider != '' }}"
+        INPUT_GCP_PROJECT_ID_PRESENT: "${{ inputs.gcp_project_id != '' }}"
+        INPUT_GCP_SERVICE_ACCOUNT_PRESENT: "${{ inputs.gcp_service_account != '' }}"
         INPUT_USE_VERTEX_AI: '${{ inputs.use_vertex_ai }}'
         INPUT_USE_GEMINI_CODE_ASSIST: '${{ inputs.use_gemini_code_assist }}'
     - name: 'Configure Gemini CLI'