🐛 Replace fsconn with local connection for docker files, allow running commands

[preslavgerchev]

Fixes #3813

• Replace the FS conn with a local connection as we need this to able to fully resolve the docker file's properties (such as the owner).
• Inject the local OS's family into the dockerfile asset to help the local connection run the right commands to be able to fetch users
• Improve error messages that come from the users manager

[github-actions]

Test Results

2 984 tests  ±0   2 983 ✅ ±0   1m 26s ⏱️ -1s
  329 suites ±0       1 💤 ±0 
   23 files   ±0       0 ❌ ±0 

Results for commit f350194. ± Comparison against base commit 3fd1be3.

♻️ This comment has been updated with latest results.