Chown user group

Dockerfile

@@ -1,4 +1,5 @@
 FROM alpine
+
 LABEL "repository"="https://github.com/WiktorJ/github-tag-action"
 LABEL "homepage"="https://github.com/WiktorJ/github-tag-action"
 LABEL "maintainer"="Wiktor Jurasz"
@@ -9,8 +10,13 @@ RUN install ./contrib/semver /usr/local/bin
 COPY entrypoint.sh /entrypoint.sh
 
 RUN apk add --no-cache git
-RUN chown -R $USER /github/workspace
-RUN git config --global --add safe.directory /github/workspace
-RUN apk update && apk add bash git curl jq
+RUN apk update && apk add bash curl jq
+
+# Change the ownership of files in /github/workspace
+RUN addgroup -g 1000 mygroup && \
+    adduser -D -u 1000 -G mygroup myuser && \
+    chown -R myuser:mygroup /github/workspace
+
+USER myuser
 
 ENTRYPOINT ["/entrypoint.sh"]