Improve buildrpms.sh for nightly builds

[daniviga]

cc @m-kuhn

Description

Improve a bit the buildrpms.sh. Now with the -u flag it is possible to generate packages with a version based on the git commit id (short). Priority of the package is managed via Epoch (latest build is always considered newer when in 'unstable' mode).

This allows nightly builds to be created on copr. The workflow is:

• GIT is cloned and master checked out
• SRPM is generated via buildrpms.sh -u -s
• SRPM is uploaded to COPR via copr-cli
• TODO: installation is tested in an ephemeral LXD container

CI build is available here: https://ci.services.vigano.me/#/builders/1/builds/6
Results will be (hopefully) published here: https://copr.fedorainfracloud.org/coprs/dani/qgis-testing/build/621301/

Checklist

Reviewing is a process done by project maintainers, mostly on a volunteer basis. We try to keep the overhead as small as possible and appreciate if you help us to do so by completing the following items. Feel free to ask in a comment if you have troubles with any of them.

• Commit messages are descriptive and explain the rationale for changes
• Commits which fix bugs include fixes #11111 in the commit message next to the description
• Commits which add new features are tagged with [FEATURE] in the commit message
• Commits which change the UI or existing user workflows are tagged with [needs-docs] in the commit message and containt sufficient information in the commit message to be documented
• I have read the QGIS Coding Standards and this PR complies with them
• This PR passes all existing unit tests (test results will be reported by travis-ci after opening this PR)
• New unit tests have been added for core changes
• I have run the scripts/prepare-commit.sh script before each commit

[m-kuhn]

Great work @daniviga
Once the copr autobuilds are in place, can we add instructions for these to qgis homepage? And would it be possible / would you be willing to have this on a qgis Fedora account?

[daniviga]

Once the copr autobuilds are in place, can we add instructions for these to qgis homepage? And would it be possible / would you be willing to have this on a qgis Fedora account?

Hi @m-kuhn, sorry for the late response, I didn't have much time to work on personal projects.
I almost completed the work to have a CD/CI (at least, checking that the package can be installed) via buildbot + copr. Now I'm going to setup a daily or weekly builds for it. Unfortunately COPR has been very slow in these last days with a long looooong build queue, so that slowed down a bit the work.

I would be very happy to have instruction on how to use these builds on the the QGIS website. About using a fedora account I will try, hopefully this weekend, to get in touch with the Fedora maintainers to understand how to proceed.