Add support for environment variables (#294)

- Closes #232
- Fixes #24

.github/workflows/integration.yml

@@ -45,6 +45,12 @@ jobs:
       uses: './'
       with:
         working_directory: '${{ github.workspace }}/example-app'
+        build_env_vars: |-
+          FOO=bar
+          ZIP=zap
+        env_vars: |-
+          FOO=bar
+          ZIP=zap
 
     - name: 'Verify deployment'
       run: |-

README.md

@@ -57,6 +57,34 @@ jobs:
     the additional deliverables may require additional roles for your service
     account user.
 
+-   `build_env_vars`: (Optional) List of key=value pairs to set as environment
+    variables during tbe build process. This will overwrite any duplicate key
+    environment variables defined in the app.yaml.
+
+    ```yaml
+    with:
+      build_env_vars: |-
+        FOO=bar
+        ZIP=zap
+    ```
+
+    Note: To include environment variables defined in another file, use the
+    [`includes` directive][includes-directive] in your app.yaml.
+
+-   `env_vars`: (Optional) List of key=value pairs to set as environment
+    variables. This will overwrite any duplicate key environment variables
+    defined in the app.yaml.
+
+    ```yaml
+    with:
+      env_vars: |-
+        FOO=bar
+        ZIP=zap
+    ```
+
+    Note: To include environment variables defined in another file, use the
+    [`includes` directive][includes-directive] in your app.yaml.
+
 -   `image_url`: (Optional) Deploy with a specific container image. The image
     url must be from one of the valid GCR hostnames (example, `gcr.io/`).
 
@@ -200,3 +228,4 @@ jobs:
 [create-key]: https://cloud.google.com/iam/docs/creating-managing-service-account-keys
 [app-engine-admin-api]: https://console.cloud.google.com/apis/api/appengine.googleapis.com/overview
 [app-engine-nodejs-docs]: https://cloud.google.com/appengine/docs/standard/nodejs/console#console
+[includes-directive]: https://cloud.google.com/appengine/docs/legacy/standard/python/config/appref#includes

action.yml

@@ -24,6 +24,19 @@ inputs:
       files (such as app.yaml) in the current directory.
     required: false
 
+  build_env_vars:
+    description: |-
+      List of key=value pairs to set as environment variables during tbe build
+      process. This will overwrite any duplicate key environment variables
+      defined in the app.yaml.
+    required: false
+
+  env_vars:
+    description: |-
+      List of key=value pairs to set as environment variables. This will
+      overwrite any duplicate key environment variables defined in the app.yaml.
+    required: false
+
   image_url:
     description: |-
       Deploy with a specific container image. The image URL must be from one of