extras: add dockerfile for building with old versions of go

This isn't meant for production, just dev & test when needing to ensure
that heketi can be built using older go versions.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

extras/docker/oldgo-fromsource/Dockerfile

@@ -0,0 +1,47 @@
+# set author and base
+FROM fedora
+MAINTAINER Heketi Developers <heketi-devel@gluster.org>
+ARG HEKETI_REPO="https://github.com/heketi/heketi.git"
+ARG HEKETI_BRANCH="master"
+ARG GO_VERSION=1.13.15
+
+LABEL version="1.3.1"
+LABEL description="Development build"
+
+# let's setup all the necessary environment variables
+ENV BUILD_HOME=/build
+ENV GOPATH=$BUILD_HOME/golang
+ENV PATH=$GOPATH/bin:$PATH
+# where to clone from
+ENV HEKETI_REPO=$HEKETI_REPO
+ENV HEKETI_BRANCH=$HEKETI_BRANCH
+ENV GO111MODULE=off
+
+# install dependencies, build and cleanup
+RUN mkdir $BUILD_HOME $GOPATH && \
+    dnf -y install git make mercurial findutils && \
+    dnf -y clean all && \
+    curl -o /tmp/go.tar.gz "https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz" && \
+    tar -xzv -C /opt/  -f /tmp/go.tar.gz && \
+    export GOROOT=/opt/go && \
+    export PATH=$GOROOT/bin:$PATH && \
+    mkdir -p $GOPATH/src/github.com/heketi && \
+    cd $GOPATH/src/github.com/heketi && \
+    git clone -b $HEKETI_BRANCH $HEKETI_REPO && \
+    cd $GOPATH/src/github.com/heketi/heketi && \
+    make && \
+    mkdir -p /etc/heketi /var/lib/heketi && \
+    make install prefix=/usr && \
+    cp /usr/share/heketi/container/heketi-start.sh /usr/bin/heketi-start.sh && \
+    cp /usr/share/heketi/container/heketi.json /etc/heketi/heketi.json && \
+    cd && rm -rf $BUILD_HOME && \
+    rm -rf /opt/go && \
+    dnf -y remove git mercurial && \
+    dnf -y autoremove && \
+    dnf -y clean all
+
+VOLUME /etc/heketi /var/lib/heketi
+
+# expose port, set user and set entrypoint with config option
+ENTRYPOINT ["/usr/bin/heketi-start.sh"]
+EXPOSE 8080

extras/docker/oldgo-fromsource/README.md

@@ -0,0 +1,11 @@
+# Overview
+The main purpose of this container is for testing building heketi
+with old versions of go to ensure it remains compatible with older
+distributions, etc.
+
+# Example:
+
+```
+$ docker build --rm --tag <username>/heketi:oldgo .
+```
+