add gh workflow

Author: jonhealy1

.github/workflows/deploy_mkdocs.yml

@@ -0,0 +1,53 @@
+name: Publish docs via GitHub Pages
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      # Rebuild website when docs have changed or code has changed
+      - "README.md"
+      - "docs/**"
+      - "**.py"
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Deploy docs
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout main
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.8
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install \
+            stac_fastapi/core \
+            stac_fastapi/elasticsearch[docs] \
+            stac_fastapi/opensearch \
+
+      - name: update API docs
+        run: |
+          pdocs as_markdown \
+            --output_dir docs/src/api/ \
+            --exclude_source \
+            --overwrite \
+            stac_fastapi
+        env:
+          APP_HOST: 0.0.0.0
+          APP_PORT: 8082
+          ES_HOST: opensearch
+          ES_PORT: 9202
+          ES_USE_SSL: false
+          ES_VERIFY_CERTS: false
+          BACKEND: opensearch
+
+      - name: Deploy docs
+        run: mkdocs gh-deploy --force -f docs/mkdocs.yml