Allow tracker script name configuration via secret

[stordahl]

Overview

Closes #136 by allowing the tracker script to have a custom name by setting CF_TRACKER_NAME. To allow this, we also add an env cli command to enable updating counterscale related secrets.

Changes by Package

@counterscale/cli

• Adds a new command; env that can be used to update counterscale secrets/env variable async from deployments.
  • To start, users can use this command to update their API token and configure the tracker script name

@counterscale/server

• Creates an assets binding to enable requesting assets directly
• Adds a dynamic route that serves the tracker script from the assets binding, using the custom name if configured. The script still defaults to tracker.js for backward compat
  • Noting that I've done some initial testing and this change doesn't have a meaningful impact on tracker script loading perf

@counterscale/tracker

Other Changes

Additional Notes

[codecov]

Codecov Report

❌ Patch coverage is 69.91150% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.58%. Comparing base (15480a7) to head (c3bd5b2).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/cli/src/lib/ui.ts	46.15%	20 Missing and 8 partials ⚠️
packages/cli/src/commands/install.ts	0.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   85.16%   84.58%   -0.59%     
==========================================
  Files          53       55       +2     
  Lines        1773     1855      +82     
  Branches      495      517      +22     
==========================================
+ Hits         1510     1569      +59     
- Misses        235      252      +17     
- Partials       28       34       +6     

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