Update Dockerfile files

Author: phansys

Dockerfile

@@ -1,7 +1,15 @@
+# syntax=docker/dockerfile:1
+
 FROM ruby:2.7-alpine
 
-# an explicitly blank version appears to grab latest
-# override here for a real build process
+LABEL org.opencontainers.image.authors='Stelligent'
+LABEL org.opencontainers.image.licenses='MIT'
+LABEL org.opencontainers.image.source='https://github.com/stelligent/cfn_nag'
+LABEL org.opencontainers.image.title='cfn_nag'
+LABEL org.opencontainers.image.vendor='Stelligent'
+
+# An explicitly blank version appears to grab latest.
+# Pass the required version with `--build-arg version=${YOUR_VERSION}` for a real build process.
 ARG version=''
 
 RUN gem install cfn-nag --version "$version"

Dockerfile-dev

@@ -1,11 +1,20 @@
+# syntax=docker/dockerfile:1
+
 FROM ruby:2.7-alpine
 
-COPY . /
+LABEL org.opencontainers.image.authors='Stelligent'
+LABEL org.opencontainers.image.licenses='MIT'
+LABEL org.opencontainers.image.source='https://github.com/stelligent/cfn_nag'
+LABEL org.opencontainers.image.title='cfn_nag for development'
+LABEL org.opencontainers.image.vendor='Stelligent'
 
-RUN apk add --update build-base \
-    curl \
-    git
+COPY . /
 
-RUN gem install bundler
-RUN gem install rubocop
-RUN bundle install
+RUN apk add --update --no-cache \
+        build-base \
+        curl \
+        git \
+    && gem install \
+        bundler '~> 2.4' \
+        rubocop '~1.67' \
+    && bundle install

Dockerfile.local

@@ -1,5 +1,13 @@
+# syntax=docker/dockerfile:1
+
 FROM ruby:2.7-alpine
 
+LABEL org.opencontainers.image.authors='Stelligent'
+LABEL org.opencontainers.image.licenses='MIT'
+LABEL org.opencontainers.image.source='https://github.com/stelligent/cfn_nag'
+LABEL org.opencontainers.image.title='cfn_nag'
+LABEL org.opencontainers.image.vendor='Stelligent'
+
 ARG version
 
 COPY cfn-nag-${version}.gem /