[dbpatchmanager] Verify dbpatch builds and runs on Linux (Ubuntu 24.04)

[ormico]

Description

Cross-repo prerequisite — action needed in ormico/dbpatchmanager

dbpatch is a .NET application. .NET is cross-platform, so it should run on Linux, but this needs verification with the current release (v2.1.2, targeting .NET 5.0).

What needs verification

1. dbpatch v2.1.2 runs on Ubuntu 24.04 with .NET 6.0 runtime (forward roll from .NET 5.0)
2. All commands used in CI (dbpatch build, dbpatch addpatch, etc.) work on Linux
3. File path handling works with forward slashes (no Windows-only assumptions)
4. The existing install-dbpatch.sh from the release works on Ubuntu 24.04

Acceptance criteria

• dbpatch runs on Ubuntu 24.04 with .NET 6.0 runtime
• dbpatch --version works
• dbpatch build connects to MySQL via ODBC on Linux and applies patches