improve generate function structure

apps/generator/Dockerfile

@@ -1,5 +1,3 @@
-ARG ASYNCAPI_GENERATOR_VERSION=1.10.9
-
 FROM node:18-alpine
 
 WORKDIR /app
@@ -8,14 +6,17 @@ WORKDIR /app
 ENV PUPPETEER_EXECUTABLE_PATH /usr/bin/chromium-browser
 ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
 
+# Include the ARG instruction in this build stage
+ARG ASYNCAPI_GENERATOR_VERSION=1.10.9
+
 # Since 0.30.0 release Git is supported and required as a dependency
 # Since 0.14.0 release of html-template chromium is needed for pdf generation.
 # More custom packages for specific template should not be added to this dockerfile. Instead, we should come up with some extensibility solution.
-RUN apk --update add git chromium && \
-    rm -rf /var/lib/apt/lists/* && \
-    rm /var/cache/apk/*
+# The --no-cache prevents from caching of the package index which saves space by not storing the APK cache files.
+# Install dependencies and AsyncAPI Generator in a single RUN command
+RUN apk --no-cache add git chromium && \
+    rm -rf /var/cache/apk/* && \
+    npm install -g --ignore-scripts "@asyncapi/generator@${ASYNCAPI_GENERATOR_VERSION}"
 
-# Installing latest released npm package
-RUN npm install -g @asyncapi/generator@$ASYNCAPI_GENERATOR_VERSION
 
 ENTRYPOINT [ "ag" ]