fix(docker): set WORKDIR to root in loki Dockerfiles #19941
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The distroless static image has workdir set to /home/nonroot, owned by the user nonroot with uid of 65532 and permission of 700. Since the user is changed to loki with uid 1001, this can cause the startup of container to fail, as there is no permission to enter the workdir.
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(cherry picked from commit 13f2b1a)
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The change done in #19502 can cause problems when for instance using user namespace mappings.
This is because the distroless static image has workdir set to /home/nonroot, owned by the user
nonroot with uid of 65532 and permission of 700. Since the user is changed to
loki with uid 10001, this can cause the startup of container to fail, as there is
no permission to enter the workdir.