add github action for edxapp db dump

.github/workflows/docker-compose.yml.mysqldbdump

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+version: '3'
+services:
+  mysql:
+    image: mysql:5.6
+    container_name: edx.devstack.mysql
+    ports:
+      - '3306:3306'
+    environment:
+      MYSQL_ROOT_PASSWORD: ""
+      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
+    volumes:
+      - ./init:/docker-entrypoint-initdb.d
+    healthcheck:
+      test: ["CMD", "mysqladmin" ,"ping", "-h", "localhost"]
+      timeout: 20s
+      retries: 10
+  edxapp:
+    image: edxops/edxapp:latest
+    command: bash -c 'source /edx/app/edxapp/edxapp_env && cd /edx/app/edxapp/edx-platform/ && /edx/app/edxapp/venvs/edxapp/bin/python manage.py lms migrate && /edx/app/edxapp/venvs/edxapp/bin/python manage.py cms migrate'
+    volumes:
+       - ../../:/edx/app/edxapp/edx-platform
+    depends_on:
+      mysql:
+        condition: service_healthy

.github/workflows/init/01.sql

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+CREATE DATABASE IF NOT EXISTS `edxapp`;
+CREATE DATABASE IF NOT EXISTS `edxapp_csmh`;
+GRANT ALL PRIVILEGES ON *.* TO 'edxapp001'@'%' IDENTIFIED BY 'password';

.github/workflows/mysqldbdump.yml

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+name: mysqldbdump
+on:
+  push:
+    branches:
+      - 'master'
+jobs:
+  mysqldbdump:
+    name: mysqldbdump
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Migrate
+        run: docker-compose -f ./.github/workflows/docker-compose.yml.mysqldbdump up -d
+      - name: Dump database
+        run: docker exec -i edx.devstack.mysql mysqldump -u'edxapp001' -p'password' edxapp > edxapp.sql
+      - name: Commit dump file to repo.
+        run: ./.github/workflows/mysqldbdump_pr.sh
+        env:
+          GH_ACCESS_TOKEN: ${{ secrets.EDX_DEPLOYMENT_GH_TOKEN }}

.github/workflows/mysqldbdump_pr.sh

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+#! /usr/bin/env bash
+
+export GITHUB_USER='edx-deployment'
+export GITHUB_TOKEN=$GH_ACCESS_TOKEN
+export GITHUB_EMAIL='edx-deployment@edx.org'
+export REPO_NAME='edx-platform'
+export DB_NAME='edxapp'
+
+cd ..
+
+# install hub
+curl -L -o hub.tgz https://github.com/github/hub/releases/download/v2.14.2/hub-linux-amd64-2.14.2.tgz
+tar -zxvf hub.tgz
+
+cd "$REPO_NAME"
+
+git config --global user.name "${GITHUB_USER}"
+git config --global user.email "${GITHUB_EMAIL}"
+
+obsolete_dump_pr=`../hub-linux*/bin/hub pr list -s open  | grep 'github-actions-mysqldbdump' | awk '{print $1}' | sed 's/\#//g'`
+if [[ ! -z $obsolete_dump_pr ]]; then
+ ../hub-linux*/bin/hub issue update $obsolete_dump_pr -s closed
+fi
+
+git checkout -b github-actions-mysqldbdump/$GITHUB_SHA
+git add "${DB_NAME}".sql
+git commit  -m "MySQLdbdump" --author "GitHub Actions MySQLdbdump automation <admin@edx.org>"
+git push --set-upstream origin github-actions-mysqldbdump/$GITHUB_SHA
+../hub-linux*/bin/hub pull-request -m "${DB_NAME} MySQL database dump" -m "MySQL database dump" -l github-actions-mysqldbdump