feat: update exclusions.json suggestions and refactor Dockerfile for improved npm installation

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:3.20
 
 RUN apk add --no-cache bash nodejs npm git \
     && node --version \
@@ -7,10 +7,11 @@ RUN apk add --no-cache bash nodejs npm git \
 
 WORKDIR /action
 
+COPY app/package.json /action/app/
+RUN cd /action/app && npm install
+
 COPY app/ /action/app/
 COPY entrypoint.sh /entrypoint.sh
-
-RUN cd /action/app && npm install && \
-    chmod +x /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
 ENTRYPOINT ["/entrypoint.sh"]