Uncomment disabled workflow triggers and test entries

[pyramation]

Uncomment disabled workflow triggers and test entries

Summary

During the v5 migration, several workflow sections were temporarily commented out to speed up CI. This PR re-enables them now that the migration is finalized:

• .github/workflows/docker.yaml: Uncommented push/pull_request triggers (were commented out during v5 migration).
• .github/workflows/run-tests.yaml: Uncommented jobs/knative-job-worker test matrix entry.

Note: The explorer v5 updates (server.ts rewrite, dependency upgrades, tsconfig changes) that were originally part of this branch were already merged into main via PR #715. After resolving merge conflicts, those changes are no longer part of this PR's diff.

Review & Testing Checklist for Human

• knative-job-worker tests are failing in CI — the test attempts to connect to PostgreSQL as root instead of postgres, producing FATAL: role "root" does not exist. This is a pre-existing issue that was hidden while the test was commented out. Decide whether to fix the test config in this PR or a follow-up.
• node-sqitch Docker build is also failing — the Dockerfile downloads cpm from https://git.io/cpm, which appears to be broken (returns invalid content). This is an external infrastructure issue unrelated to this PR. Decide whether this needs to be addressed before merging.
• Verify docker workflow triggers are appropriate — the uncommented triggers will now fire on pushes to main/v1/release/* and PRs to main/v1 when docker/** or the workflow file changes. Confirm this matches the desired branching strategy.

Recommended test plan: Both non-required CI checks (knative-job-worker and node-sqitch Docker build) are currently failing due to pre-existing issues. All 41 other checks pass. Review the two failures and decide whether they need fixes before or after merging this PR.

Notes

• Both CI failures are non-required checks, so the PR is mergeable as-is.
• The knative-job-worker failure likely needs a fix to its test setup (e.g., setting PGUSER=postgres or adjusting the test's connection config).
• The node-sqitch Docker build failure is caused by git.io URL shortener returning invalid content — this will need the Dockerfile updated to use a direct URL for cpm.

Link to Devin run: https://app.devin.ai/sessions/28b19aa472a64dc3b9831d510a3fe15f
Requested by: @pyramation

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