First attempt at a hybrid Java/Andrpid/Go/Gomobile docker image

Dockerfile

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+# Android section of this Dockerfile from https://medium.com/@elye.project/intro-to-docker-building-android-app-cb7fb1b97602
+
+FROM openjdk:8
+
+
+ENV SDK_URL="https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip" \
+    ANDROID_HOME="/usr/local/android-sdk" \
+    ANDROID_VERSION=28 \
+    ANDROID_BUILD_TOOLS_VERSION=28.0.1
+
+## Download Android SDK
+RUN mkdir "$ANDROID_HOME" .android \
+    && cd "$ANDROID_HOME" \
+    && curl -o sdk.zip $SDK_URL \
+    && unzip sdk.zip \
+    && rm sdk.zip \
+    && yes | $ANDROID_HOME/tools/bin/sdkmanager --licenses
+
+## Install Android Build Tool and Libraries
+RUN $ANDROID_HOME/tools/bin/sdkmanager --update
+RUN $ANDROID_HOME/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS_VERSION}" \
+    "platforms;android-${ANDROID_VERSION}" \
+    "platform-tools"
+
+# Install NDK
+RUN $ANDROID_HOME/tools/bin/sdkmanager "ndk-bundle"
+
+# Go section of this Dockerfile from Docker golang: https://github.com/docker-library/golang/blob/master/1.10/alpine3.8/Dockerfile
+# Adapted from alpine apk to debian apt
+
+## set up nsswitch.conf for Go's "netgo" implementation
+## - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
+## - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
+RUN echo 'hosts: files dns' > /etc/nsswitch.conf
+
+ENV GOLANG_VERSION 1.10.3
+
+RUN set -eux; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		 bash \
+		build-essential \
+		openssl \
+		libssl-dev \
+		golang \
+	; \
+	rm -rf /var/lib/apt/lists/*; \
+	export \
+## set GOROOT_BOOTSTRAP such that we can actually build Go
+		GOROOT_BOOTSTRAP="$(go env GOROOT)" \
+## ... and set "cross-building" related vars to the installed system's values so that we create a build targeting the proper arch
+## (for example, if our build host is GOARCH=amd64, but our build env/image is GOARCH=386, our build needs GOARCH=386)
+		GOOS="$(go env GOOS)" \
+		GOARCH="$(go env GOARCH)" \
+		GOHOSTOS="$(go env GOHOSTOS)" \
+		GOHOSTARCH="$(go env GOHOSTARCH)" \
+	; \
+## also explicitly set GO386 and GOARM if appropriate
+## https://github.com/docker-library/golang/issues/184
+	aptArch="$(dpkg-architecture  -q DEB_BUILD_GNU_CPU)"; \
+	case "$aptArch" in \
+		arm) export GOARM='6' ;; \
+		x86_64) export GO386='387' ;; \
+	esac; \
+	\
+	wget -O go.tgz "https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz"; \
+	echo '567b1cc66c9704d1c019c50bef946272e911ec6baf244310f87f4e678be155f2 *go.tgz' | sha256sum -c -; \
+	tar -C /usr/local -xzf go.tgz; \
+	rm go.tgz; \
+	\
+	cd /usr/local/go/src; \
+	./make.bash; \
+	\
+	export PATH="/usr/local/go/bin:$PATH"; \
+	go version
+
+ENV GOPATH /go
+ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+
+RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
+
+# Add in gomobile
+
+RUN go get golang.org/x/mobile/cmd/gomobile
+
+RUN gomobile init -ndk $ANDROID_HOME/ndk-bundle/
+
+##WORKDIR $GOPATH
+RUN mkdir /application
+WORKDIR /application
+