ARM64 support for the Panel Docker image, closes pterodactyl#3580 (pterodactyl#3709)

Co-authored-by: Dane Everitt <dane@daneeveritt.com>

Author: trenutoo

.github/workflows/docker.yml

@@ -36,12 +36,14 @@ jobs:
         if: "!contains(github.ref, 'develop')"
         with:
           push: true
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}
       - name: Release Development Build
         uses: docker/build-push-action@v2
         if: "contains(github.ref, 'develop')"
         with:
           push: ${{ github.event_name != 'pull_request' }}
+          platforms: linux/amd64,linux/arm64
           tags: ${{ steps.docker_meta.outputs.tags }}
           labels: ${{ steps.docker_meta.outputs.labels }}

Dockerfile

@@ -2,15 +2,15 @@
 # Build the assets that are needed for the frontend. This build stage is then discarded
 # since we won't need NodeJS anymore in the future. This Docker image ships a final production
 # level distribution of Pterodactyl.
-FROM mhart/alpine-node:14
+FROM --platform=$TARGETOS/$TARGETARCH mhart/alpine-node:14
 WORKDIR /app
 COPY . ./
 RUN yarn install --frozen-lockfile \
     && yarn run build:production
 
 # Stage 1:
 # Build the actual container with all of the needed PHP dependencies that will run the application.
-FROM php:7.4-fpm-alpine
+FROM --platform=$TARGETOS/$TARGETARCH php:7.4-fpm-alpine
 WORKDIR /app
 COPY . ./
 COPY --from=0 /app/public/assets ./public/assets

docker-compose.example.yml

@@ -34,7 +34,7 @@ x-common:
 #
 services:
   database:
-    image: library/mysql:8.0
+    image: mariadb:10.5
     restart: always
     command: --default-authentication-plugin=mysql_native_password
     volumes: