ci: replace certificate caching with artifact uploads

.github/workflows/ci.yml

@@ -25,11 +25,12 @@ jobs:
           mkcert -install
           mkcert -cert-file certs/localhost.pem -key-file certs/localhost-key.pem localhost 127.0.0.1 ::1
 
-      - name: Cache certificates
-        uses: actions/cache/save@v4
+      - name: Upload certificates
+        uses: actions/upload-artifact@v4
         with:
-          path: certs
-          key: certs-${{ runner.os }}-${{ github.sha }}
+          name: ssl-certs
+          path: certs/
+          retention-days: 1
 
   frontend:
     name: Frontend CI
@@ -42,11 +43,11 @@ jobs:
       - uses: actions/checkout@v4
       - uses: oven-sh/setup-bun@v2
 
-      - name: Restore certificates
-        uses: actions/cache/restore@v4
+      - name: Download certificates
+        uses: actions/download-artifact@v4
         with:
-          path: certs
-          key: certs-${{ runner.os }}-${{ github.sha }}
+          name: ssl-certs
+          path: certs/
 
       - name: Install dependencies
         run: bun install --frozen-lockfile
@@ -87,11 +88,11 @@ jobs:
           enable-cache: true
           cache-dependency-glob: "backend/uv.lock"
 
-      - name: Restore certificates
-        uses: actions/cache/restore@v4
+      - name: Download certificates
+        uses: actions/download-artifact@v4
         with:
-          path: certs
-          key: certs-${{ runner.os }}-${{ github.sha }}
+          name: ssl-certs
+          path: certs/
 
       - name: Lint & Test
         run: |
@@ -116,11 +117,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Restore Certificates
-        uses: actions/cache/restore@v4
+      - name: Download Certificates
+        uses: actions/download-artifact@v4
         with:
-          path: certs
-          key: certs-${{ runner.os }}-${{ github.sha }}
+          name: ssl-certs
+          path: certs/
 
       - name: Setup Tools
         uses: astral-sh/setup-uv@v5