ci: run the jobs in the runner image (#120)

The workflows' containers are now lithosananke-runner:72b6cf370db1, built
and published by runner-image.yml, with everything init installs and Maven
already in it; the install steps are gone, except the documents' packages in
nightly-docs.yml and release.yml. The registry refuses anonymous pulls, so
each job pulls with PACKAGES_TOKEN.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GE3SDvQn5EoxdGufk84zz2

.gitea/workflows/build.yml

@@ -16,7 +16,10 @@ jobs:
     name: Image ${{ matrix.board }}
     runs-on: ubuntu-latest
     container:
-      image: gitea/runner-images:ubuntu-24.04-v26.11.03   # the runner's own ubuntu-latest is Debian 11 (node:20-bullseye)
+      image: gitea.starshipos-f18.org/rajames/lithosananke-runner:72b6cf370db1   # ci/runner-image (#120)
+      credentials:                # the registry refuses anonymous pulls
+        username: rajames
+        password: ${{ secrets.PACKAGES_TOKEN }}
     timeout-minutes: 45
     strategy:
       fail-fast: false
@@ -31,9 +34,6 @@ jobs:
           fetch-depth: 0          # the SBOM's version is git describe
           lfs: false              # only the logs and DoE CSVs are in LFS; the build needs neither
 
-      - name: Install the build's dependencies
-        run: make ARCH=${{ matrix.arch }} init INIT_DOCS=0
-
       - name: Boot image
         run: make boot_image TARGET=${{ matrix.board }}
 
@@ -52,15 +52,15 @@ jobs:
     name: v4 tests (32- and 64-bit cells)
     runs-on: ubuntu-latest
     container:
-      image: gitea/runner-images:ubuntu-24.04-v26.11.03   # the runner's own ubuntu-latest is Debian 11 (node:20-bullseye)
+      image: gitea.starshipos-f18.org/rajames/lithosananke-runner:72b6cf370db1   # ci/runner-image (#120)
+      credentials:                # the registry refuses anonymous pulls
+        username: rajames
+        password: ${{ secrets.PACKAGES_TOKEN }}
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
         with:
           lfs: false
 
-      - name: Install the build's dependencies
-        run: make ARCH=amd64 init INIT_DOCS=0
-
       - name: make -C v4 test
         run: make -C v4 test