add GitHub action

- update release in README.md
- add action run checks
- add action release
- remove release.sh

.github/workflows/run-checks.yml

@@ -0,0 +1,12 @@
+name: Pull request validation
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.github/**'
+
+jobs:
+  validate:
+    uses: swordsteel/hlaeja-common-workflows/.github/workflows/run-checks.yml@master
+    secrets:
+      CI_BOT_PAT: ${{ secrets.CI_BOT_PAT }}