fix pod security context fs permissions

[lkingland]

Fixes a mismatch in container file permissions, surfacing during local E2E testing when switching between local, remote, and builders.

$ func deploy --remote --builder=pack --registry=registry.default.svc.cluster.local:5000/func -v
  Error: cannot upload sources to the PVC: cannot start the pod: pod prematurely exited (output: "ERROR: cannot purge dest dir: unlinkat
  /tmp/volume_mnt/source/.s2i/bin/assemble: permission denied\n", exitcode: 1)
      e2e_test.go:1249: exit status 1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.02%. Comparing base (0157893) to head (f59a423).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2946      +/-   ##
==========================================
+ Coverage   59.28%   60.02%   +0.74%     
==========================================
  Files         132      132              
  Lines       16835    16836       +1     
==========================================
+ Hits         9980    10106     +126     
+ Misses       5926     5772     -154     
- Partials      929      958      +29     

Flag	Coverage Δ
e2e-tests	41.32% <100.00%> (+1.44%)	⬆️
integration-tests	54.80% <100.00%> (+1.70%)	⬆️
unit-tests	46.89% <0.00%> (-0.01%)	⬇️

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[gauron99]

/lgtm
/approve
/hold for matej review

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, lkingland

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• OWNERS [gauron99,lkingland]

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[matejvasek]

/lgtm

[matejvasek]

/unhold