CI: tag docker images properly

Signed-off-by: Yan Minari <yangm97@gmail.com>

contrib/semver/docker.sh

@@ -0,0 +1,61 @@
+#!/bin/sh
+
+# Get the last tag
+TAG=$(git describe --abbrev=0 --tags --match="v[0-9]*\.[0-9]*\.[0-9]*" 2>/dev/null)
+
+# Did getting the tag succeed?
+if [ $? != 0 ] || [ -z "$TAG" ]; then
+  printf -- "unknown"
+  exit 1
+fi
+
+# Get the current branch
+BRANCH=$(git symbolic-ref -q HEAD --short 2>/dev/null)
+
+# Did getting the branch succeed?
+if [ $? != 0 ] || [ -z "$BRANCH" ]; then
+  BRANCH="master"
+fi
+
+# Split out into major, minor and patch numbers
+MAJOR=$(echo $TAG | cut -c 2- | cut -d "." -f 1)
+MINOR=$(echo $TAG | cut -c 2- | cut -d "." -f 2)
+PATCH=$(echo $TAG | cut -c 2- | cut -d "." -f 3)
+
+main () {
+    # Check if the branch name is master
+    if [ "$BRANCH" = "master" ]; then
+        printf "latest"
+        exit 0
+    fi
+    # If it is something other than master, just use it
+    printf "$BRANCH"
+}
+
+full () {
+    if [ "$BRANCH" = "master" ]; then
+        printf '%d.%d.%d' "$((MAJOR))" "$((MINOR))" "$((PATCH))"
+        exit 0
+    fi
+    printf '%d.%d.%d-%s' "$((MAJOR))" "$((MINOR))" "$((PATCH))" "$BRANCH"
+}
+
+majorminor () {
+    if [ "$BRANCH" = "master" ]; then
+        printf '%d.%d' "$((MAJOR))" "$((MINOR))"
+        exit 0
+    fi
+    printf '%d.%d-%s' "$((MAJOR))" "$((MINOR))" "$BRANCH"
+}
+
+major () {
+    if [ "$BRANCH" = "master" ]; then
+        printf "$((MAJOR))"
+        exit 0
+    fi
+    printf '%d-%s' "$((MAJOR))" "$BRANCH"
+}
+
+for arg in "$@"; do
+    $arg
+done