ci: migrate to github actions

Dockerfile

@@ -7,31 +7,4 @@ EXPOSE 80
 
 COPY filebrowser /filebrowser
 
-# Create appuser.
-ENV USER=root
-ENV GROUP=root
-ENV UID=0
-ENV GID=0
-ENV UMASK=022
-
-RUN if [ "$GID" -ne 0 ]; then \
-    addgroup \
-    -g "${GID}" \
-    "${GROUP}" ; \
-    fi;
-
-RUN adduser \
-    -g "" \
-    -D \
-    -G "${GROUP}" \
-    -H \
-    -h "/nonexistent" \
-    -s "/sbin/nologin" \
-    -u "${UID}" \
-    "${USER}"
-
-USER ${USER}:${GROUP}
-
-RUN umask ${UMASK}
-
 ENTRYPOINT [ "/filebrowser" ]