Add ABI compatibility report deploy

Closes: libevent#887

.github/workflows/abi.yml

@@ -0,0 +1,73 @@
+---
+name: abi
+
+on:
+  push:
+    branches:
+      - master
+    ## TODO: use source tag name in the destination repo
+    #tags:
+    #  - release-*
+
+jobs:
+  abi:
+    runs-on: ubuntu-18.04
+    ## TODO: use docker image, but for now this is not possible without hacks
+    ## due to even public registry require some authentication:
+    ## - https://github.community/t5/GitHub-Actions/docker-pull-from-public-GitHub-Package-Registry-fail-with-quot/td-p/32782/page/5
+    #container: docker.pkg.github.com/azat/docker-images/lvc-debian
+    if: "!contains(github.event.head_commit.message, 'ci skip')"
+    strategy:
+      fail-fast: false
+
+    steps:
+      - uses: actions/[email protected]
+
+      - name: Install Dependencies
+        run:
+          sudo apt install
+            abi-tracker
+            abi-monitor
+            abi-dumper
+            abi-compliance-checker
+            pkgdiff
+            vtable-dumper
+
+      - name: Generate
+        shell: bash
+        run: |
+          ./extra/abi-check/abi_check.sh
+        env:
+          ABI_CHECK_ROOT: /tmp/le-abi-root
+
+      - name: Deploy
+        env:
+          LIBEVENT_DEPLOY_ABI_PRI: ${{ secrets.LIBEVENT_DEPLOY_ABI_PRI }}
+          COMMIT_ID: ${{ github.sha }}
+        run: |
+          [[ -n $LIBEVENT_DEPLOY_ABI_PRI ]] || exit 0
+
+          mkdir -p ~/.ssh
+          echo "$LIBEVENT_DEPLOY_ABI_PRI" > ~/.ssh/id_rsa
+          chmod 600 ~/.ssh/id_rsa
+          ssh-keyscan github.com >> ~/.ssh/known_hosts
+
+          user_name="${{ github.event.head_commit.author.name }}"
+          user_email="${{ github.event.head_commit.author.email }}"
+          short_commit_id="${COMMIT_ID:0:7}"
+          owner_name="${{ github.event.repository.owner.name }}"
+
+          cd /tmp/le-abi-root/work/abi-check/timeline/libevent/
+          git init
+          git config --local user.name $user_name
+          git config --local user.email $user_email
+          git add -f .
+          git commit -m "Update ABI/API backward compatibility report (libevent/libevent@$short_commit_id)"
+          git push -f [email protected]:$owner_name/abi master
+
+      # XXX: requires container-id for docker
+      - uses: actions/upload-artifact@v1
+        if: failure()
+        with:
+          name: build
+          path: /tmp/le-abi-root