GitHubPulls: output sorted json without using jq

Dependencies

• [2] XMM2AZRA [ Fix #531 ] Trim github pr plugin store paths.
• [3] D5YPJDT6 Add GithubPulls input plugin.
• [4] FCNC325Z GithubPulls: Add 'revision' to the input
• [5] CWUG4XMB fix github pulls json to be deterministic
• [6] DTQQ72FU fix a stray newline in a path

Change contents

• edit in src/lib/Hydra/Plugin/GithubPulls.pm at line 56
  [3.1810]

  [3.1810]
  +
• replacement in src/lib/Hydra/Plugin/GithubPulls.pm at line 58
  [3.1891]→[3.1891:1926](∅→∅)
  − print $fh encode_json \%pulls;
  [3.1891]

  [3.1926]
  + print $fh JSON->new->utf8->canonical->encode(\%pulls);
• replacement in src/lib/Hydra/Plugin/GithubPulls.pm at line 60
  [3.1941]→[3.56:127](∅→∅),[3.127]→[2.0:79](∅→∅)
  − system("jq -S . < $filename > $tempdir/github-pulls-sorted.json");

  − my $storePath = trim(`nix-store --add "$tempdir/github-pulls-sorted.json"`
  [3.1941]

  [2.79]
  +

  + my $storePath = trim(`nix-store --add "$filename"`