add workflow to run goreleaser snapshot

Author: nickysemenza

.github/workflows/snapshot.yml

@@ -0,0 +1,18 @@
+name: Image snapshots
+
+on:
+  push:
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: make snapshot
+      - name: Archive snapshot artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: binaries
+          path: dist/