Increase docker operations timeout

Closes #2667 (closed)

@marin I wasn't able to perfectly test if this will fix the issue, simply because the issue is not guaranteed to be reproduced. However, I am pretty confident this sure has a absolute minimum risk factor. We anyway had set timeout for build operation to 10mins. In this MR, we set that for build,get and push operations to 20mins.

Successful build: https://dev.gitlab.org/gitlab/omnibus-gitlab/-/jobs/1328007

@balasankarc What do you think about adding an ENV variable too so we can override it in the CI?

@marin Well, we can definitely do that. For simplicity, shall we use the same variable for both read and write timeouts?

Sure, it will already be an improvement :)

@marin Done.

Ooh. I should probably add tests too.

assigned to @balasankarc

Added tests

assigned to @marin

approved this merge request

added Pick into Stable label

merged

mentioned in commit 0d07b9a9

mentioned in commit df89666d

mentioned in commit d3862da1

Picked into 9-5-stable for 9.5 RC3

removed Pick into Stable label