Add awesomebot github action

Awesomebot will check all the links in README.md and ensure they're
still alive.

Includes example (img.shields.io has been a problem on my own repos)
showing how to whitelist sites with intermittent issues so they
don't block PR checks.

- Whitelisted http://127.0.0.1:8080 because the link checker finds it
  in the examples section.
- Whitelisted https://github.com/lima-vm/lima/releases/download so the
  link checker doesn't complain about the variable interpolation

Use `--request-delay 1` so that it doesn't hit rate limits for sites
that have multiple links pointing at them.

Signed-off-by: Joe Block <[email protected]>

whitelist test for download link

Author: unixorn

.github/workflows/awesomebot.yml

@@ -0,0 +1,18 @@
+name: Check links in README.md
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: docker://dkhamsing/awesome_bot:latest
+      with:
+        args: /github/workspace/README.md --allow-dupe --allow-redirect --request-delay 1 --white-list https://img.shields.io,http://127.0.0.1:8080,https://github.com/lima-vm/lima/releases/download