refactor: rm docker folder

docker/gradle-java-codebase.Dockerfile

@@ -1,28 +0,0 @@
-# Docker build script for Gradle codebases
-#
-# This script will host a particular Gradle build's classes over HTTP. The root
-# directory of the Gradle project is expected to be the build context, and the
-# build process will build the application and copy over the class files.
-#
-# This Dockerfile only works for Java codebases.
-
-
-# Don't need an old JDK version here
-# Just use it for consistency
-FROM openjdk:8u171-alpine
-
-# Copy the source tree into the container
-WORKDIR /usr/local/src/
-COPY . /usr/local/src/
-
-# Build
-RUN [ "./gradlew", "classes" ]
-
-
-# Use an HTTP server
-FROM httpd:alpine
-
-# Copy the classes
-COPY --from=0 \
-    /usr/local/src/build/classes/java/main/ \
-    /usr/local/apache2/htdocs/