refactor: Update tests.yml to download and cache Go echo server

This commit modifies the tests.yml file to download and cache the Go echo server artifact. It removes the previous step that uploaded the echo server artifact and replaces it with a new step that downloads and restores the cached artifact using the actions/cache/restore action. This change improves the efficiency of the workflow by avoiding unnecessary artifact uploads and ensures consistent usage of the echo server across different workflow runs.

.github/workflows/tests.yml

@@ -82,16 +82,6 @@ jobs:
             ~/build/bin/echo
           key: ${{ runner.os }}-spinify-${{ env.echo-cache-name }}-${{ hashFiles('tool/echo/echo.go') }}
 
-      - name: 💾 Upload Go echo server
-        id: upload-echo-server
-        uses: actions/upload-artifact@v4
-        with:
-          name: echo-server
-          path: ~/build/bin/echo
-          compression-level: 6
-          overwrite: true
-          retention-days: 1
-
   tests:
     name: "Tests"
     runs-on: ubuntu-latest
@@ -103,6 +93,7 @@ jobs:
       image: dart:stable
     env:
       pub-cache-name: pub
+      echo-cache-name: echo
     timeout-minutes: 15
     steps:
       - name: 🚂 Get latest code
@@ -116,11 +107,13 @@ jobs:
             test
             analysis_options.yaml
 
-      - name: 📂 Download Echo server
-        uses: actions/download-artifact@v4
+      - name: 📂 Download Go echo server
+        id: cache-echo-restore
+        uses: actions/cache/restore@v4
         with:
-          name: echo-server
-          path: ~/build/bin/
+          path: |
+            ~/build/bin/echo
+          key: ${{ runner.os }}-spinify-${{ env.echo-cache-name }}-${{ hashFiles('tool/echo/echo.go') }}
 
       - name: 📤 Restore Pub modules
         id: cache-pub-restore
@@ -141,6 +134,7 @@ jobs:
         id: install-dependencies
         timeout-minutes: 1
         run: |
+          test -f ~/build/bin/echo
           apt-get update && apt-get install -y lcov
           dart pub get --no-example