Add support for "extra conf" startup options

We need this to be able to stop bin logs and other
configuration settings, because MySQL 8.0 comes with
it enabled by defaults and that eats the tmpfs
really quickly for big test suites.

This is built on top of mirromutth#6
that has been added to our fork already.

README.md

@@ -1,4 +1,4 @@
-# MySQL GitHub Action [![Test status](https://github.com/mirromutth/mysql-action/workflows/test/badge.svg)](https://github.com/mirromutth/mysql-action/actions)
+# MySQL GitHub Action [![Test status](https://github.com/mirromutth/mysql-action/workflows/test/badge.svg)](https://github.com/stronk7/mysql-action/actions)
 
 This [GitHub Action](https://github.com/features/actions) sets up a MySQL database in Docker.
 
@@ -23,6 +23,10 @@ steps:
     mysql password: ${{ secrets.DatabasePassword }} # Required if "mysql user" exists. The password for the "mysql user"
     use tmpfs: true # Optional, default value is false. Mounts /var/lib/mysql to tmpfs (i.e. in RAM) for increased performance
     tmpfs size: '2048M' # Optional, default value is '1024M'. Desired size of above-mentioned tmpfs volume
+    extra conf: | # Optional, default is ''. Other configuration options to be added on startup.
+        --max_allowed_packet=16MB
+        --skip-log-bin
+        ...
 ```
 
 If want bind MySQL host port to 3306, please see [The Default MySQL](#the-default-mysql).

action.yml

@@ -49,6 +49,10 @@ inputs:
     description: "Desired size of tmpfs volume"
     required: false
     default: "1024M"
+  extra conf:
+    description: "Other configuration options, to be added to the startup (--max_allowed_packet=16MB --skip-log-bin ...)"
+    required: false
+    default: ''
 runs:
   using: 'docker'
   image: 'Dockerfile'

entrypoint.sh

@@ -33,4 +33,9 @@ fi
 docker_run="$docker_run -d -p $INPUT_HOST_PORT:$INPUT_CONTAINER_PORT mysql:$INPUT_MYSQL_VERSION --port=$INPUT_CONTAINER_PORT"
 docker_run="$docker_run --character-set-server=$INPUT_CHARACTER_SET_SERVER --collation-server=$INPUT_COLLATION_SERVER"
 
+if [ -n "$INPUT_EXTRA_CONF" ]; then
+    echo "Other startup extra configuration: $INPUT_EXTRA_CONF"
+
+docker_run="$docker_run $INPUT_EXTRA_CONF"
+
 sh -c "$docker_run"