rootless causes invalid buildkitd mount path to be used

[steved]

The error looked like this:

time="2023-07-17T19:20:12Z" level=warning msg="currently, only the default worker can be used."
time="2023-07-17T19:20:12Z" level=warning msg="TLS is disabled for unix:///run/user/%!s(float64=1000)/buildkit/buildkitd.sock"
buildkitd: mkdir /run/user/%!s(float64=1000): permission denied
[rootlesskit:child ] error: command [buildkitd --config /etc/buildkit/buildkitd.toml] exited: exit status 1
[rootlesskit:parent] error: child exited: exit status 1

Before:

$ helm template . -s templates/buildkit/configmap.yaml
[snip]
address = [ "tcp://0.0.0.0:1234", "unix:///run/user/%!s(float64=1000)/buildkit/buildkitd.sock" ]

$ helm template . -s templates/buildkit/configmap.yaml --set buildkit.rootlessUser=1234
[snip]
address = [ "tcp://0.0.0.0:1234", "unix:///run/user/%!s(int64=1234)/buildkit/buildkitd.sock" ]

After:

$ helm template . -s templates/buildkit/configmap.yaml
[snip]
address = [ "tcp://0.0.0.0:1234", "unix:///run/user/1000/buildkit/buildkitd.sock" ]

$ helm template . -s templates/buildkit/configmap.yaml --set buildkit.rootlessUser=1234
[snip]
address = [ "tcp://0.0.0.0:1234", "unix:///run/user/1234/buildkit/buildkitd.sock" ]