fix(nginx plugin): place mime.types next to nginx.conf so include resolves

[mikeland73]

Summary

Fixes #2908.

The nginx plugin currently fails to start because it cannot find its mime.types file:

[emerg] open() ".../devbox.d/nginx/mime.types" failed (2: No such file or directory) in .../devbox.d/nginx/nginx.conf:6

Root cause: PR #2844 added include mime.types; to nginx.conf and created the mime.types file at {{ .Virtenv }}/mime.types (.devbox/virtenv/nginx/mime.types), under the assumption that nginx -p $NGINX_PATH_PREFIX would make the relative include resolve against the prefix path. In fact nginx only uses the -p prefix for runtime paths (error_log, access_log, root, …); at configuration time, relative include paths are resolved relative to the nginx.conf file itself, which devbox places in the DevboxDir (devbox.d/nginx/).

Fix: Create mime.types in the DevboxDir alongside nginx.conf, so the relative include mime.types; resolves correctly. This mirrors how the plugin already handles fastcgi.conf (also created in DevboxDir). The plugin version is bumped 0.0.5 → 0.0.6 so existing environments pick up the relocated file.

-    "{{ .Virtenv }}/mime.types": "nginx/mime.types",
+    "{{ .DevboxDir }}/mime.types": "nginx/mime.types",

How was it tested?

• Verified plugins/nginx.json remains valid JSON.
• Traced the file-placement logic: nginx.conf is created at {{ .DevboxDir }}/nginx.conf and uses a relative include mime.types;; placing mime.types in the same DevboxDir makes the include resolvable. The fastcgi.conf file already follows this exact placement pattern.
• No other references to the {{ .Virtenv }}/mime.types path exist in the codebase, and the nginx env.test.txt testscript does not assert on the mime.types location, so behavior is unchanged apart from the fix.

Reproduction from the issue (devbox add nginx && devbox services up -b) previously left the service failing with the mime.types [emerg] error; with mime.types placed next to nginx.conf, the config-time include resolves.

cc @jefft (issue reporter)

Community Contribution License

All community contributions in this pull request are licensed to the project
maintainers under the terms of the
Apache 2 License.

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Pull request overview

This PR fixes the nginx plugin startup failure caused by include mime.types; being resolved relative to the generated nginx.conf location (in devbox.d/nginx/), while mime.types was previously created under the virtenv prefix.

Changes:

• Bump nginx plugin version from 0.0.5 to 0.0.6 so existing environments pick up the fix.
• Relocate mime.types creation from {{ .Virtenv }} to {{ .DevboxDir }} so include mime.types; resolves during config parsing.

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