add retry to docker pull

[bogyo210]

No description provided.

[shiroyasha]

Looks good.

Please also run it throught shell-check. If OK, shipit.

[bogyo210]

Not sure about the last line, the rest passed:
https://semaphore.semaphoreci.com/jobs/d651e6bd-14c3-4b96-93ad-5cfcffc82ced

[shiroyasha]

@bogyo210 thanks for adding it. My idea with this was:

• It is not feasable to fix every problem atm
• We can still use shell-check to limit the number of newly introduced problems.

For the cache script, it is 154 errors atm. I set it incorrectly to 152. Please modify this.

[shiroyasha]

However, now when I check it, every number is off... Damn... Any idea how to achive this?

I want to set an upper limit for errors to make sure that we are not introducing new ones.

[bogyo210]

merged to nb/shellcheck, pr will come from that