feat(ci): use custom cache for rust

.forgejo/workflows/test.yml

@@ -1,8 +1,21 @@
 on: [push, pull_request]
 jobs:
-  ls:
+  test:
     runs-on: docker
     steps:
       - uses: actions/checkout@v4
-      - uses: https://github.com/moonrepo/setup-rust@v1
-      - run: JWT_SECRET="$(./scripts/generate_secret.sh)" cargo test
+      - name: Cache Cargo Build
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-cargo-build
+        with:
+          path: 
+            | target/debug
+            | ~/.cargo/registry
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/libalexandria.rlib') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+      - run: rustup update stable && rustup default stable
+      - run: JWT_SECRET="$(./scripts/generate_secret.sh)" cargo test --verbose