create gh action to update sssom context (#371)

Co-authored-by: Anita Caron <anitacaron@users.noreply.github.com>

.github/workflows/update_context.yml

@@ -0,0 +1,27 @@
+name: Update sssom context
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 12 * * 1"
+jobs:
+  update_context:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Work around permission issue
+        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
+
+      - name: Update sssom context
+        run: make deploy-dm
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v3
+        if: ${{ success() }}
+        with:
+          commit-message: Update sssom.context
+          title: 'Update sssom.context'
+          body: |
+            This pull request updates sssom.context. Make sure you run make tests manually.
+          assignees: matentzn