Use GitHub Actions and remove Travis

[xalopp]

Type of PR

• Bugfix
• New Feature
• Other (explain):

Use GitHub Actions as CI

Breaking changes

• Yes, this is a breaking change

Description

We want to use GitHub Actions in the future

[codecov]

Codecov Report

Merging #193 (1196a7b) into master (541db46) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #193   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       150       150           
===========================================
  Files              8         8           
  Lines            568       611   +43     
===========================================
+ Hits             568       611   +43     

Impacted Files	Coverage Δ
MO4/Sniffs/Arrays/MultiLineArraySniff.php	100.00% <0.00%> (ø)
MO4/Sniffs/Commenting/PropertyCommentSniff.php	100.00% <0.00%> (ø)
MO4/Sniffs/WhiteSpace/ConstantSpacingSniff.php	100.00% <0.00%> (ø)
...4/Sniffs/Arrays/ArrayDoubleArrowAlignmentSniff.php	100.00% <0.00%> (ø)
...iffs/Formatting/UnnecessaryNamespaceUsageSniff.php	100.00% <0.00%> (ø)
...iffs/Strings/VariableInDoubleQuotedStringSniff.php	100.00% <0.00%> (ø)

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[xalopp]

@mmoll happy?

[xalopp]

@mmoll the slack integration isn't yet working because of Settings - Actions secrets:

Secrets are not passed to workflows that are triggered by a pull request from a fork. Learn more. 

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
1.3% Duplication