ci: add automatic docker image building

.gitlab/ci/testCIScripts.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+
+# test all CI scripts
+
+SCRIPT_DIR=$(dirname "$0")
+
+TAG_VERSION=$(sh $SCRIPT_DIR/getRegistryTag.sh "v1.0.0")
+TAG_TEST=$(sh $SCRIPT_DIR/getRegistryTag.sh "TEST")
+BRANCH_NAME=$(sh $SCRIPT_DIR/getRegistryBranch.sh "very:first:test")
+
+# Leaving out pushAsLatestVersion.sh as its controll flow
+# is based on the same condition as getRegistryTag.sh
+
+if [ $TAG_VERSION != "1.0.0" ]; then
+	echo "ERROR in CI SCRIPT: $SCRIPT_DIR/getRegistryTag.sh"
+	return 1
+fi
+
+if [ $TAG_TEST != "TEST" ]; then
+	echo "ERROR in CI SCRIPT: $SCRIPT_DIR/getRegistryTag.sh"
+	return 2
+fi
+
+if [ $BRANCH_NAME != "test" ]; then
+	echo "ERROR in CI SCRIPT: $SCRIPT_DIR/getRegistryBranch.sh"
+	return 3
+fi
+
+return 0