get version from readme.md

hooks/_env

@@ -1,12 +1,14 @@
 #!/bin/bash
-if [[ ! -f "/tmp/${SOURCE_COMMIT}" ]]; then
-  ver=`TZ=UTC date -u +"%Y.%m.%d"`
-  if [[ "${GIT_BRANCH}" != "master" ]]; then
-    ver+="-${GIT_BRANCH}"
-  fi
-  echo ${ver} > "/tmp/${SOURCE_COMMIT}"
+export PATH=".:$PATH"
+
+export VERSION=`cat README.md | grep -i "# Versions" -A 1 | tail -n 1 | sed 's/^[* ]*//;s/[* ]*$//'`
+if [[ "${GIT_BRANCH}" != "master" ]]; then
+    export VERSION="${VERSION}-${GIT_BRANCH}"
 fi
 
+export X86="i386 amd64"
+export ARM="armv7hf aarch64" # armv5e armv6 not available in balenalib
+
 manifestArch() {
   local options
   case $1 in
@@ -24,9 +26,4 @@ manifestArch() {
       options="arm64 --variant v8" ;;
   esac
   echo ${options}
-}
-
-export VERSION=`cat "/tmp/${SOURCE_COMMIT}"`
-export X86="i386 amd64"
-export ARM="armv7hf aarch64" # armv5e armv6 not available in balenalib
-export PATH=".:$PATH"
+}