add versioning script.

Author: Joe Monaghan

Dockerfile

@@ -15,6 +15,7 @@ FROM alpine:3.11.3
 RUN apk --no-cache add ca-certificates \
      && addgroup exporter \
      && adduser -S -G exporter exporter
+ADD VERSION .
 USER exporter
 COPY --from=build /bin/main /bin/main
 ENV LISTEN_PORT=9171

VERSION

@@ -0,0 +1 @@
+1.0.0

release-version.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# ensure git is in the correct branch and has latest from remote.
+git checkout master
+git pull origin master
+
+version=$(cat VERSION.txt)
+echo "version: $version"
+
+# exist if tag alredy exists.
+if [ $(git tag -l "$version") ]; then
+  echo "tag already exists. Ensure verion number has been update in VERSION."
+  exit 1
+fi
+
+# check version is in the correct format.
+if ! [[ "$version" =~ ^[0-9.]+$ ]]; then
+  echo "version: "$version" is in the wrong format."
+  exit 1
+fi
+
+# tag current latest commit.
+echo "tagging..."
+git tag $version
+
+# push tag to trigger build.
+echo "pushing tag to trigger build..."
+git push origin $version