chore(repo): prune dead code and duplicate abstractions (#3413)

.github/actions/ci-helper/action.yml

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+name: CI helper
+description: Restore or build the shared Rust CI helper
+inputs:
+  save:
+    description: Save a missing helper cache on main
+    required: false
+    default: 'false'
+runs:
+  using: composite
+  steps:
+    - name: Restore ci helper
+      id: cache
+      uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9
+      with:
+        path: target/debug/fluxer-ci
+        key: >-
+          fluxer-ci-bin-${{ runner.os }}-1.98.1-${{ hashFiles('Cargo.lock', 'Cargo.toml',
+          'tools/ci/Cargo.toml', 'tools/ci/src/**') }}
+    - name: Build ci helper
+      if: steps.cache.outputs.cache-hit != 'true'
+      shell: bash
+      run: cargo build --locked --package fluxer-ci
+    - name: Save ci helper
+      if: inputs.save == 'true' && github.ref == 'refs/heads/main' && steps.cache.outputs.cache-hit != 'true'
+      uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9
+      with:
+        path: target/debug/fluxer-ci
+        key: ${{ steps.cache.outputs.cache-primary-key }}