Add workflow to update namespace Typescript definitions

Author: Planeshifter

.github/workflows/update_namespace_definitions.yml

@@ -0,0 +1,76 @@
+#/
+# @license Apache-2.0
+#
+# Copyright (c) 2021 The Stdlib Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#/
+
+# Workflow name:
+name: update_namespace_definitions
+
+# Workflow triggers:
+on:
+  # Allow the workflow to be manually run:
+  workflow_dispatch:
+
+# Workflow jobs:
+jobs:
+
+  # Define a job for pushing changes to standalone packages...
+  update:
+
+    # Define a display name:
+    name: "Update Namespace Typescript Definitions"
+
+    # Define the type of virtual host machine:
+    runs-on: ubuntu-latest
+
+    # Define the sequence of job steps...
+    steps:
+
+      # Checkout the repository:
+      - name: 'Checkout repository'
+        uses: actions/checkout@v2
+        with:
+          # Specify whether to remove untracked files before checking out the repository:
+          clean: true
+
+          # Limit clone depth to the most recent commit:
+          fetch-depth: 1
+
+          # Specify whether to download Git-LFS files:
+          lfs: false
+        timeout-minutes: 10
+
+      # Install Node.js:
+      - name: 'Install Node.js'
+        uses: actions/setup-node@v2
+        with:
+          node-version: 15
+        timeout-minutes: 5
+
+      # Install dependencies:
+      - name: 'Install dependencies'
+        run: |
+          make install-node-modules
+        timeout-minutes: 15
+
+      # Update namespace Typescript definitions:
+      - name: 'Update namespace Typescript definitions'
+        run: |
+          make list-pkgs-namespaces | node lib/node_modules/@stdlib/_tools/scripts/create_namespace_types.js
+
+      # Create a pull request with the updated definitions:
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3