ci: return 7 symbols short git hash on branch build

[cuyk]

What

For some reason git rev-parse --short HEAD started to return 8 symbols hash. It breaks updating OSS revision on cloud.

How

Return 7 symbols with git rev-parse --short=7 HEAD

[supertopher]

weird, ¯_(ツ)_/¯

I wonder if the underlying version of git changed

[colesnodgrass]

--short[=length]
Same as --verify but shortens the object name to a unique prefix with at least length characters. The minimum length is 4, the default is the effective value of the core.abbrev configuration variable

And core.abbrev is defined as

Set the length object names are abbreviated to. If unspecified or set to "auto", an appropriate value is computed based on the approximate number of packed objects in your repository, which hopefully is enough for abbreviated object names to stay unique for some time. If set to "no", no abbreviation is made and the object names are shown in their full length. The minimum length is 4.

My guess is that the number of packed objects in our repo has exceeded some value that caused it to increase the number of characters returned to help ensure uniqueness.