MDL-74905 ci: travis and gha, some adjustments

Apply for some of the improvements made for 4.2:
- Use our own moodlehq/mysql-action
- Define the tmpfs size and ensure that binlogs are disabled.

.github/workflows/push.yml

@@ -66,14 +66,16 @@ jobs:
     steps:
       - name: Setting up DB mysql
         if: ${{ matrix.db == 'mysqli' }}
-        uses: johanmeiring/mysql-action@tmpfs-patch
+        uses: moodlehq/mysql-action@v1
         with:
           collation server: utf8mb4_bin
           mysql version: 5.7
           mysql database: test
           mysql user: test
           mysql password: test
           use tmpfs: true
+          tmpfs size: '1024M'
+          extra conf: --skip-log-bin
 
       - name: Setting up DB pgsql
         if: ${{ matrix.db == 'pgsql' }}

.travis.yml

@@ -81,7 +81,8 @@ install:
             sudo service mysql stop
             sudo mv /var/lib/mysql /mnt/ramdisk
             sudo ln -s /mnt/ramdisk/mysql /var/lib/mysql
-            sudo service mysql restart
+            echo -e "[mysqld]\nskip-log-bin" | sudo tee -a /etc/mysql/my.cnf
+            sudo service mysql start
         fi
     - >
         if [ "$DB" = 'pgsql' ];
@@ -92,6 +93,7 @@ install:
             sudo mv /var/lib/postgresql /mnt/ramdisk
             sudo ln -s /mnt/ramdisk/postgresql /var/lib/postgresql
             sudo service postgresql start 9.6
+            sh -c 'until pg_isready -p 5432; do echo "Waiting for the DB to be up..."; sleep 2; done'
         fi
     - >
         if [ "$TASK" = 'PHPUNIT' ];