fix: Make entrypoint gitlab friendly

Dockerfile

@@ -1,7 +1,8 @@
 FROM alpine
 ARG VERSION
 
+ADD ./docker/entrypoint.sh /usr/local/bin/docker-entrypoint
 RUN apk update && apk add --no-cache git ca-certificates && update-ca-certificates
 COPY "./bin/semantic-release_v${VERSION}_linux_amd64" /usr/local/bin/semantic-release
 
-ENTRYPOINT ["semantic-release"]
+ENTRYPOINT ["docker-entrypoint"]

docker/entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -e
+
+if [ "$GITLAB_CI" == "true" ]; then
+    # Gitlab CI environment detected, skipping entrypoint
+    exit 0
+fi
+
+if [ "$1" == "semantic-release" ]; then
+    # remove first argument
+    shift 1
+fi
+
+exec semantic-release "$@"