profilarr: Fix ARCH assignment in profilarr.sh to support Profilarr build usage

[mpeleshenko]

✍️ Description

Fix profilarr update error coming from deno compile as ARCH is not set when updating an existing installation, but is used when setting DENO_TARGET.

🔗 Related Issue

None

✅ Prerequisites (X in brackets)

• Self-review completed – Code follows project standards.
• Tested thoroughly – Changes work as expected.
• No security risks – No hardcoded secrets, unnecessary privilege escalations, or permission issues.

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🛠️ Type of Change (X in brackets)

• 🐞 Bug fix – Resolves an issue without breaking functionality.
• ✨ New feature – Adds new, non-breaking functionality.
• 💥 Breaking change – Alters existing functionality in a way that may require updates.
• 🆕 New script – A fully functional and tested script or script set.
• 🌍 Website update – Changes to script metadata (PocketBase/website data).
• 🔧 Refactoring / Code Cleanup – Improves readability or maintainability without changing functionality.
• 📝 Documentation update – Changes to README, AppName.md, CONTRIBUTING.md, or other docs.

[MickLesk]

Whats the issue? I dont See any Change with the Line Switch. 🤔

[mpeleshenko]

When running update in the container after I had previously installed 2.0.4 from scratch, I got an error about an invalid parameter -u for the deno compile command. I traced it down to DENO_TARGET="${ARCH}-unknown-linux-gnu" requiring ARCH to be set, but when there is no deno update, it is not set, so I moved it outside the if to cater to both deno and profilarr updates.

[michelroegl-brunner]

Yes, $ARCH is required in Line 77

[SystemIdleProcess]

Since update does clean, need to mkdir /opt/profilarr/app before it can copy the build there.

[MickLesk]

Make an PR ^^