Adds openresty workflow

.github/workflows/proxy-tests.yml

@@ -0,0 +1,24 @@
+name: proxy-tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+
+      - uses: leafo/gh-actions-openresty@v1
+        with:
+          openrestyVersion: "1.19.9.1"
+
+      - name: run resty
+        run: resty -e 'print("hi from lua")'
+
+      - name: run opm
+        run: opm --cwd install leafo/pgmoon
+
+      - uses: leafo/gh-actions-luarocks@v4
+        with:
+          withLuaPath: "/usr/local/openresty/luajit/"