Add /tmp to staging

[thockin]

Fix #793

[linux-foundation-easycla]

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• ✅ login: thockin / name: Tim Hockin (7a72116)

[thockin]

/easycla

[justinsb]

Removed deliberately or misclick?

[justinsb]

I believe this will copy the permissions for /tmp (which are particularly important), because we use cp -a

LGTM though I wasn't sure whether you deliberately removed the dash symlink, so will add a hold but feel free to remove hold if deliberate.

/approve
/lgtm
/hold

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[thockin]

/etc/shadow is not needed

The symlink to dash is already covered by the dash package (redundant)

This does retain /tmp permissions:

$ make container
<...lots ot output...>
container: gcr.io/k8s-staging-git-sync/git-sync:v4.0.0-rc4-1-g7a72116__linux_amd64

$ docker run -ti --entrypoint "" gcr.io/k8s-staging-git-sync/git-sync:v4.0.0-rc4-1-g7a72116__linux_amd64 ls -ld /tmp
drwxrwxrwt 2 root root 4096 Jul 31 15:18 /tmp