fix: continue if error on gh actions tests publish

[sbrunato]

Use continue-on-error: true option to skip error when running Publish Unit Test Results GH actions step:

Pull down action image 'ghcr.io/enricomi/publish-unit-test-result-action:v1.40'
  /usr/bin/docker pull ghcr.io/enricomi/publish-unit-test-result-action:v1.40
  Error response from daemon: received unexpected HTTP status: 503 Service Unavailable
  Warning: Docker pull failed with exit code 1, back off 8.516 seconds before retry.
  /usr/bin/docker pull ghcr.io/enricomi/publish-unit-test-result-action:v1.40
  Error response from daemon: received unexpected HTTP status: 503 Service Unavailable
  Warning: Docker pull failed with exit code 1, back off 9.323 seconds before retry.
  /usr/bin/docker pull ghcr.io/enricomi/publish-unit-test-result-action:v1.40
  Error response from daemon: received unexpected HTTP status: 503 Service Unavailable
Error: Docker pull failed with exit code 1

See EnricoMi/publish-unit-test-result-action#379

[github-actions]

Unit Test Results

    2 files  ±0      2 suites  ±0   11m 4s ⏱️ +57s
319 tests ±0  316 ✔️ ±0  3 💤 ±0  0 ❌ ±0 
638 runs  ±0  632 ✔️ ±0  6 💤 ±0  0 ❌ ±0 

Results for commit 1afa30e. ± Comparison against base commit b4c8b9f.

[github-actions]

File	Coverage
All files	85%	✅

File	Coverage
All files	84%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against 1afa30e