fix: skip minification in order to allow the post job to run on self-hosted runners as well

[philipreinken]

We currently encounter problems when including this action on self-hosted runners; the post job crashes when cache restoration is impossible.

Multiple references exist to similar problems when code minification and the JS actions SDK are used (see commit message).

I was able to fix the build using this branch:

• prior failing build: https://github.com/shopware/SwagPlatformSecurity/actions/runs/13027988260/job/36340809569
• current running build using this branch: https://github.com/shopware/SwagPlatformSecurity/actions/runs/13028454313/job/36342183606

I'm aware that removing minification is not the best solution, but bun doesn't yet take the esbuild --keep-names flag into account, so this is the only way that I know of to fix this.