Add .slurm and .sbatch as shell extensions

[Young-TW]

Adds .slurm and .sbatch as extensions to the Shell language.

Description

These extensions are widely used in High Performance Computing (HPC) environments for submitting batch jobs to the Slurm Workload Manager. While they contain Slurm-specific #SBATCH directives, the syntax is fundamentally valid Shell (Bash/Sh) script.

Checklist:

• I am adding a new extension to a language.
  • The new extension is used in hundreds of repositories on GitHub.com
    • Search results for each extension:
      • https://github.com/search?q=path%3A*.slurm+SBATCH+-language%3AShell&type=code
      • https://github.com/search?q=path%3A*.sbatch+SBATCH+-language%3AShell&type=code
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • Created manually for this PR (Standard Slurm usage examples)
    • Sample license(s):
      • CC0-1.0 (Public Domain)
  • I have included a change to the heuristics to distinguish my language from others using the same extension.

[lildude]

I'm not sure this is really needed as it appears all files based on your search queries have a shebang and thus are already automatically classified as shell.

[Young-TW]

That is true for best practices, but sbatch allows running scripts without a shebang. In those cases, GitHub currently classifies them as Plain Text. This change ensures correct syntax highlighting even when the shebang is omitted.

[lildude]

That is true for best practices, but sbatch allows running scripts without a shebang. In those cases, GitHub currently classifies them as Plain Text. This change ensures correct syntax highlighting even when the shebang is omitted.

Can you please update your search queries to illustrate this.

[Young-TW]

I have updated the PR description with new search queries.

I used the -language:Shell filter. This explicitly reveals .slurm and .sbatch files that contain #SBATCH directives but are not currently recognized as Shell by Linguist (due to missing shebangs).

[lildude]

LGTM. Thanks.

Important

The changes in this PR will not appear on GitHub until the next release has been made and deployed. See here for more details.