pre-commit handling

[mpoberezhniy]

Issue: #234

Testing: I created a tag in my fork and used the following yaml for pre-commit testing.

$ cat .pre-commit-config.yaml 
repos:
-   repo: https://github.com/mpoberezhniy/differential-shellcheck
    rev: v0.0.1
    hooks:
    -   id: differential-shellcheck

$ pre-commit run
[WARNING] Unstaged files detected.
[INFO] Stashing unstaged files to ~/.cache/pre-commit/patch1714424233-141350.
Differential ShellCheck..................................................Failed
- hook id: differential-shellcheck
- duration: 0.6s
- exit code: 1

:::::::::::::::::::::
::: Used Versions :::
:::::::::::::::::::::

ShellCheck: 0.9.0
csutils: 3.2.1


:::::::::::::::::::::::::::::::
::: Differential ShellCheck :::
:::::::::::::::::::::::::::::::

📜 List of shell scripts for scanning
test.sh

ℹ️ No Fixes!

📊 Statistics of defects
Error: 0
Warning: 1
Style or Note: 1


✋ Defects, NEEDS INSPECTION
Error: SHELLCHECK_WARNING:
test.sh:2:6: warning[SC2048]: Use "$@" (with quotes) to prevent whitespace problems.
#    1|   #!/bin/sh
#    2|-> echo $*

Error: SHELLCHECK_WARNING:
test.sh:2:6: info[SC2086]: Double quote to prevent globbing and word splitting.
#    1|   #!/bin/sh
#    2|-> echo $*
### Differential ShellCheck 🐚

Scanned/Changed scripts: `1`

|                    | ❌ Added                 | ✅ Fixed                 |
|:------------------:|:------------------------:|:------------------------:|
| ⚠️ Errors / Warnings / Notes |  **2**  |  **0**  |

#### New defects statistics

|          | 👕 Style / 🗒️ Note      | ⚠️ Warning                 | 🛑 Error                 |
|:--------:|:-----------------------:|:--------------------------:|:------------------------:|
| 🔢 Count | **1** | **1** | **0** |

#### Useful links

- [Differential ShellCheck Documentation](https://github.com/redhat-plumbers-in-action/differential-shellcheck#readme)
- [ShellCheck Documentation](https://github.com/koalaman/shellcheck#readme)

---
_ℹ️ If you have an issue with this GitHub action, please try to run it in the [debug mode](https://github.blog/changelog/2022-05-24-github-actions-re-run-jobs-with-debug-logging/) and submit an [issue](https://github.com/redhat-plumbers-in-action/differential-shellcheck/issues/new)._

[INFO] Restored changes from ~/.cache/pre-commit/patch1714424233-141350.

TODO:

• Rework summary format to look nice when running from both actions and pre-commit
• Tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.17%. Comparing base (8f0e0a6) to head (6fa4c10).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
+ Coverage   84.96%   85.17%   +0.20%     
==========================================
  Files           4        4              
  Lines         286      290       +4     
==========================================
+ Hits          243      247       +4     
  Misses         43       43              

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[mpoberezhniy]

This is temporary, docker_image should be used when ready.