Refactor environment variables

Dockerfile

@@ -1,23 +1,21 @@
 FROM quay.io/fedora/fedora-minimal:42
 
 ARG RUNNER_VERSION=6.3.1
-
 ARG GITHUB_RUN_ID
 
+ENV BUILDAH_ISOLATION=chroot
+ENV HOME=/builder
+ENV REGISTRY_AUTH_FILE=/builder/.config/containers/auth.json
+
 RUN echo ${GITHUB_RUN_ID} > /.github_run_id
 
 RUN dnf5 -y --setopt install_weak_deps=false install podman buildah skopeo vim setpriv git nodejs22 diffutils
 
-ENV BUILDAH_ISOLATION=chroot
-
 RUN curl -sfL https://code.forgejo.org/forgejo/runner/releases/download/v${RUNNER_VERSION}/forgejo-runner-${RUNNER_VERSION}-linux-amd64 -o /usr/local/bin/forgejo-runner
 RUN chmod +x /usr/local/bin/forgejo-runner
 
 RUN echo "nobody:65536:65536" > /etc/subuid && echo "nobody:65536:65536" > /etc/subgid
 
-ENV HOME=/builder
-ENV REGISTRY_AUTH_FILE=/builder/.config/containers/auth.json
-
 # This is a workaround for https://github.com/containers/podman/issues/23818, apart from that it serves absolutely no purpose. I also don't know why it looks there, given HOME is elsewhere, but it doesn't seem to cause any issues.
 RUN mkdir /.config && chown 65534:65534 /.config
 
@@ -26,8 +24,6 @@ RUN mkdir /builder /builder/.config && chown -R 65534:65534 /builder
 # This works around https://github.com/redhat-actions/podman-login/pull/43, until this PR is merged at least
 RUN mkdir /builder/.docker && chown -R 65534:65534 /builder/.docker
 
-WORKDIR /builder
-
 RUN setcap cap_setuid=ep /usr/bin/newuidmap cap_setgid=ep /usr/bin/newgidmap
 
 RUN find / -mindepth 1 -path /proc -prune -or -path /sys -prune -or -path /dev -prune -or -type f -perm /6000 -exec sh -c "chmod ug-s '{}' && echo \"Removed setuid/setgid bit(s) from '{}'\"" \;
@@ -42,4 +38,6 @@ RUN chmod +x /entrypoint.sh
 
 USER 65534:65534
 
+WORKDIR /builder
+
 CMD ["/entrypoint.sh"]