enable dependabot for GitHub actions

[ranocha]

This allows to get updates for GitHub actions automatically. I have used this for my own packages, the Trixi.jl framework, and the SciML organization. After merging this, you could also enable other Dependabot actions in 'Settings -> Code security and analysis -> Dependabot alerts' and '... -> Dependabot security updates'.

See https://github.com/SciML/MuladdMacro.jl/pull/37

[jishnub]

@ranocha Tests are failing while trying to fetch julia-actions/julia-runtest@master. I wonder if this is the correct branch?

[ranocha]

Tests are failing while trying to fetch julia-actions/julia-runtest@master. I wonder if this is the correct branch?

I didn't change anything there at first. We are using v1 - I changed the file accordingly.

[jishnub]

Thanks, it seems the branch has been renamed to main, and the script in this repo hadn't been updated in a while. v1 is the recommended usage these days

[codecov[bot]]

Codecov Report

Merging #327 (d1a2bfc) into master (add7611) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #327   +/-   ##
=======================================
  Coverage   98.67%   98.67%           
=======================================
  Files           5        5           
  Lines         452      452           
=======================================
  Hits          446      446           
  Misses          6        6           

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