Add omes image build (#323)

Author: Sushisource

.github/workflows/omes.yml

@@ -0,0 +1,19 @@
+name: Omes Testing
+on:
+  push:
+    branches:
+      - main
+      - "releases/*"
+
+jobs:
+  omes-image-build:
+    needs: build-lint-test
+    uses: temporalio/omes/.github/workflows/docker-images.yml@main
+    secrets: inherit
+    with:
+      lang: dotnet
+      sdk-repo-url: ${{ github.event.pull_request.head.repo.full_name || 'temporalio/sdk-dotnet' }}
+      sdk-repo-ref: ${{ github.event.pull_request.head.ref || github.ref }}
+      # TODO: Remove once we have a good way of cleaning up sha-based pushed images
+      docker-tag-ext: ci-latest
+      do-push: true