Don't update major, minor and patch version on pre-release

Fixes #108

entrypoint.sh

@@ -98,7 +98,11 @@ translateDockerTag() {
   elif isOnDefaultBranch; then
     TAGS="latest"
   elif isGitTag && usesBoolean "${INPUT_TAG_SEMVER}" && isSemver "${GITHUB_REF}"; then
-    TAGS=$(echo "${GITHUB_REF}" | sed -e "s/refs\/tags\///g" | sed -E "s/v?([0-9]+)\.([0-9]+)\.([0-9]+)(-[a-zA-Z]+(\.[0-9]+)?)?/\1.\2.\3\4 \1.\2\4 \1\4/g")
+    if isPreRelease "${GITHUB_REF}"; then
+      TAGS=$(echo "${GITHUB_REF}" | sed -e "s/refs\/tags\///g" | sed -E "s/v?([0-9]+)\.([0-9]+)\.([0-9]+)(-[a-zA-Z]+(\.[0-9]+)?)?/\1.\2.\3\4/g")
+    else
+      TAGS=$(echo "${GITHUB_REF}" | sed -e "s/refs\/tags\///g" | sed -E "s/v?([0-9]+)\.([0-9]+)\.([0-9]+)/\1.\2.\3\4 \1.\2\4 \1\4/g")
+    fi
   elif isGitTag && usesBoolean "${INPUT_TAG_NAMES}"; then
     TAGS=$(echo "${GITHUB_REF}" | sed -e "s/refs\/tags\///g")
   elif isGitTag; then
@@ -163,6 +167,10 @@ isSemver() {
   echo "${1}" | grep -Eq '^refs/tags/v?([0-9]+)\.([0-9]+)\.([0-9]+)(-[a-zA-Z]+(\.[0-9]+)?)?$'
 }
 
+isPreRelease() {
+  echo "${1}" | grep -Eq '-'
+}
+
 useSnapshot() {
   local TIMESTAMP=`date +%Y%m%d%H%M%S`
   local SHORT_SHA=$(echo "${GITHUB_SHA}" | cut -c1-6)

test.bats

@@ -147,7 +147,8 @@ teardown() {
 /usr/local/bin/docker logout"
 }
 
-@test "with tag semver it pushes tags using the pre-releases" {
+@test "with tag semver it pushes tags using the pre-release, but does not update the major, minor or patch version" {
+  # as pre-release versions tend to be unstable
   # https://semver.org/#spec-item-11
 
   SUFFIXES=('alpha.1' 'alpha' 'ALPHA' 'ALPHA.11' 'beta' 'rc.11')
@@ -161,10 +162,8 @@ teardown() {
     expectStdOutContains "::set-output name=tag::1.1.1-${SUFFIX}"
 
     expectMockCalledContains "/usr/local/bin/docker login -u USERNAME --password-stdin
-/usr/local/bin/docker build -t my/repository:1.1.1-${SUFFIX} -t my/repository:1.1-${SUFFIX} -t my/repository:1-${SUFFIX} .
+/usr/local/bin/docker build -t my/repository:1.1.1-${SUFFIX} .
 /usr/local/bin/docker push my/repository:1.1.1-${SUFFIX}
-/usr/local/bin/docker push my/repository:1.1-${SUFFIX}
-/usr/local/bin/docker push my/repository:1-${SUFFIX}
 /usr/local/bin/docker inspect --format={{index .RepoDigests 0}} my/repository:1.1.1-${SUFFIX}
 /usr/local/bin/docker logout"
   done