[GIT-61] chore: allow .md files to be uploaded

[sangeethailango]

Description

This PR will enable the upload of .md files.

Type of Change

• Improvement (change that would cause existing functionality to not work as expected)

Summary by CodeRabbit

• New Features
  • Added support for markdown file attachments, expanding the range of supported document formats for uploads.

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[makeplane]

Linked to Plane Work Item(s)

• [GIT-61] [feature]: Allow Upload of MD files

This comment was auto-generated by Plane

[coderabbitai]

📝 Walkthrough

Walkthrough

The change expands the list of allowed MIME types for file attachments in the application settings by adding support for "text/markdown" format. This is a single configuration entry added to the ATTACHMENT_MIME_TYPES list.

Changes

Cohort / File(s)	Summary
MIME Type Configuration apps/api/plane/settings/common.py	Added "text/markdown" to ATTACHMENT_MIME_TYPES list to support markdown files as attachable documents

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A markdown hare hops through the code,
With text so fine, a growing load,
MIME types expand, the list grows wide,
Attachments now have nowhere to hide! 📎

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lacks critical information: no detailed explanation of changes, no test scenarios, no screenshots, and no linked references despite the PR ticket number GIT-61 in the title.	Add detailed explanation of the change, describe test scenarios performed, and link the related issue GIT-61 using a reference like 'Closes #XXXX' or 'Related to GIT-61'.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly matches the main change in the changeset: adding support for .md file uploads by adding 'text/markdown' to ATTACHMENT_MIME_TYPES.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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