Use Alpine 3.21 for the docker images (#32924) (#32951)

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM docker.io/library/golang:1.23-alpine3.20 AS build-env
+FROM docker.io/library/golang:1.23-alpine3.21 AS build-env
 
 ARG GOPROXY
 ENV GOPROXY=${GOPROXY:-direct}
@@ -41,7 +41,7 @@ RUN chmod 755 /tmp/local/usr/bin/entrypoint \
               /go/src/code.gitea.io/gitea/environment-to-ini
 RUN chmod 644 /go/src/code.gitea.io/gitea/contrib/autocompletion/bash_autocomplete
 
-FROM docker.io/library/alpine:3.20
+FROM docker.io/library/alpine:3.21
 LABEL maintainer="maintainers@gitea.io"
 
 EXPOSE 22 3000
@@ -78,7 +78,7 @@ ENV GITEA_CUSTOM=/data/gitea
 VOLUME ["/data"]
 
 ENTRYPOINT ["/usr/bin/entrypoint"]
-CMD ["/bin/s6-svscan", "/etc/s6"]
+CMD ["/usr/bin/s6-svscan", "/etc/s6"]
 
 COPY --from=build-env /tmp/local /
 COPY --from=build-env /go/src/code.gitea.io/gitea/gitea /app/gitea/gitea

Dockerfile.rootless

@@ -1,5 +1,5 @@
 # Build stage
-FROM docker.io/library/golang:1.23-alpine3.20 AS build-env
+FROM docker.io/library/golang:1.23-alpine3.21 AS build-env
 
 ARG GOPROXY
 ENV GOPROXY=${GOPROXY:-direct}
@@ -39,7 +39,7 @@ RUN chmod 755 /tmp/local/usr/local/bin/docker-entrypoint.sh \
               /go/src/code.gitea.io/gitea/environment-to-ini
 RUN chmod 644 /go/src/code.gitea.io/gitea/contrib/autocompletion/bash_autocomplete
 
-FROM docker.io/library/alpine:3.20
+FROM docker.io/library/alpine:3.21
 LABEL maintainer="maintainers@gitea.io"
 
 EXPOSE 2222 3000