[#1487] Fix CAM for Windows, add gitattributes and add Windows CI

[timo95]

Description

Use \n as line ending in CAM (CanonicalAdjacencyMatrixBuilder). Since the result string isn't meant to be written to files, it is better to keep it the same for all OS's.
Add .gitattributes with options to always checkout text files with LF line endings (regardless of git config). This is needed for the CAM tests in gradoop-flink and gradoop-temporal and for checkstyle (all source code has to be LF).

This restores most tests for Windows builts. Only HBase tests still fail, because to create the HBase mini-cluster on Windows a cygwin environment is necessary (See point 4 of this old HBase doc).

Related Issue

Fixes #1487

Builds on windows work, if HBase tests are skipped. For example by either skipping all tests or by excluding gradoop-hbase.

Edit: I updated the github actions to include Windows and the Readme build instructions to skip tests for Windows.

Motivation and Context

Windows builds

How Has This Been Tested?

I built it on a Windows machine. Tests fail when reaching HBase tests and the build succeeds when skipping tests.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly (if necessary).
• I have added tests to cover my changes.
• All new and existing tests passed.
• I ran a spell checker.

[timo95]

For the github actions workaround see: actions/runner-images#712

[ChrizZz110]

What are you doing? Please stop ... it's already dead.

[timo95]

Debugging Github Actions. What else?

[timo95]

There seems to be some problem with Hadoops file creation on the Windows VM. It works locally. I will test this with the new version, when #1519 is merged.

[ChrizZz110]

This looks like a lot of fun!

[timo95]

I forgot about winutils. It was already installed on my machine, so it worked there.

[timo95]

The MiniAccumuloCluster seems to fail too, so excluded both Accumulo and HBase.

[ChrizZz110]

The MiniAccumuloCluster seems to fail too, so excluded both Accumulo and HBase.

My test doesn't pass ... ignore it.

[timo95]

The tests are fine^^ Only the test cluster is... not good.

[timo95]

Finally success.

[timo95]

For now i excluded accumulo again. You can review/merge now, @galpha.

I included 2 options to the maven builds to make the log more usable.
--no-transfer-progress removes the dep download progress and -DtrimStackTrace=false shows the whole stack trace on errors.

[ChrizZz110]

LGTM - just a minor move of a comment in the readme

[galpha]

LGTM