`che-theia init` should work with commit hashes

Describe the bug

When using che-theia I can check out out a particular commit hash, only branches. When we can’t compile against current Theia master, we usually fix the build against that last commit (by hash) that che-theia still compiles against. This means that when we’re in that state, our self-hosting process does not work with what we’re currently shipping.

Che version

• latest
• nightly
• other: please specify

[tsmaeder]

Or we just remove the -b when checking out stuff. I dont’ think it would make a difference. Do you see one?

[azatsarynnyy]

I see there are several options available:

• before che-theia init, checkout Theia to a commit, that Che Theia is currently aligned with, see https://github.com/eclipse/che-theia/blob/dae92d19d167c0e00c31e44630e738dc75153dd5/build.include#L16
• build the images with something like

./build.sh --build-args:${GITHUB_TOKEN},THEIA_COMMIT_SHA=1e09b816511769eb206494c1bac1a595e95795f9 --tag:next --git-ref:refs\\/heads\\/master --dockerfile:Dockerfile.alpine --skip-tests --branch:master

• just wait for QE team finish verifying https://github.com/eclipse/che/pull/17933 and Che Theia is aligned with Theia:next https://github.com/eclipse/che-theia/pull/823