Docker: Fix sharp not installing due to npm cache permissions

Moving the npm cache folder into the /app folder solved the permission issues
Fixes #8

.gitignore

@@ -19,6 +19,7 @@ yarn-debug.log*
 yarn-error.log*
 lerna-debug.log*
 .pnpm-debug.log*
+.npm_cache
 
 # Diagnostic reports (https://nodejs.org/api/report.html)
 report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json

docker-compose-dev.yml

@@ -2,6 +2,6 @@ version: "3.7"
 
 services:
   bot:
-    command: sh -c "npm install && npm run dev"
+    command: sh -c "npm config set cache /app/.npm_cache --global && npm install && npm run dev"
     ports:
       - "9229:9229"

docker-compose.yml

@@ -3,7 +3,7 @@ version: "3.7"
 services:
   bot:
     image: node:16.9.0-alpine
-    command: sh -c "npm install && node ."
+    command: sh -c "npm config set cache /app/.npm_cache --global && npm install && node ."
     restart: unless-stopped
     environment:
       - TZ=Europe/Berlin