ci: run Harden-Runner on every job (#811)

Adds step-security/harden-runner (audit, pinned to v2.22.4 like
craft-common-actions) as the first step of each job that did not have it,
so every workflow in the org's public repos reports its egress to
StepSecurity. Audit, not block: block-mode allow lists come from each
job's observed traffic.

.github/workflows/docpath.yml

@@ -27,6 +27,10 @@ jobs:
         os: ${{ github.event_name == 'workflow_dispatch' && fromJSON('["ubuntu-latest","windows-latest","macos-latest"]') || fromJSON('["ubuntu-latest","windows-latest"]') }}
     runs-on: ${{ matrix.os }}
     steps:
+      - name: Harden runner
+        uses: step-security/harden-runner@1d88384fd173af6ecb012dfd0264a306b711241a # v2.22.4
+        with:
+          egress-policy: audit
       - uses: actions/checkout@v7
       - uses: dtolnay/rust-toolchain@b725eda525362e7cf34af9a7243cac1e3f01a7ec # stable
         with: