Add GitHub action for make all

[stweil]

It is currently configured to be triggered manually either from the
GitHub web frontend or from the GitHub API.

make all can be run with a selected version of Ubuntu and Python,
or a matrix of versions.

Signed-off-by: Stefan Weil sw@weilnetz.de

[stweil]

As soon as this PR was merged, we can run our first GitHub action for the full matrix of
[ubuntu-18.04, ubuntu-20.04] x [Python 3.6, 3.7, 3.8, 3.9, 3.10] (10 runs).

For both versions of Ubuntu, Python 3.6 and 3.7 (and 3.8 with PR #289) should build fine, while the other Python versions are expected to abort when trying to get Tensorflow 1.5.

[stweil]

Example of GitHub action with full test matrix: https://github.com/stweil/ocrd_all/actions/runs/1947808212.

Even with PR #289, only Python 3.6 builds all targets. Python 3.7 and 3.8 fail when building cor-asv-ann-check.

[bertsky]

Even with PR #289, only Python 3.6 builds all targets. Python 3.7 and 3.8 fail when building cor-asv-ann-check.

That seems to be coming from new upstream conflicts between Tensorflow and Scikit-Image. We recently encountered that in ocrd_pc_segmentation, but it seems to be wider. Needs to be investigated.

[stweil]

I rebased and merged my latest pull requests and started now the first GitHub action for OCR-D/ocrd_all with the full build matrix: https://github.com/OCR-D/ocrd_all/actions/runs/1959782165.