build: further shrinkage for the docker build

.dockerignore

@@ -1,8 +1,10 @@
-**/node_modules
+node_modules
-**/.next
+.next
 .git
 .gitconfig
 .gitignore
 .github
 **/README.md
 **/.vscode
+config/db/db.sqlite3
+config/db/logs/overseerr.log

Dockerfile

@@ -7,6 +7,7 @@ RUN yarn --frozen-lockfile && \
   yarn build
 
 # remove development dependencies
-RUN npm prune --production
+RUN yarn install --production --ignore-scripts --prefer-offline
+RUN yarn cache clean
 
 CMD yarn start