ci: drop the pnpm-store cache on 0pt (save step dominated runtime)

Caching the full pnpm store made the post-step tar/zstd run for >10 minutes on
the shared runner, turning a ~1m quality job into a 15m+ one. The concurrency
and main-only changes keep the win; install stays a plain frozen-lockfile run.

.gitea/workflows/ci.yml

@@ -36,8 +36,6 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: "22"
-          cache: "pnpm"
-          cache-dependency-path: pnpm-lock.yaml
       - name: Enable corepack + pin pnpm@9 (pnpm-lock.yaml is lockfileVersion 9.0)
         run: |
           corepack enable
@@ -134,8 +132,6 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: "22"
-          cache: "pnpm"
-          cache-dependency-path: pnpm-lock.yaml
       - name: Enable corepack + pin pnpm@9
         run: |
           corepack enable

.gitea/workflows/nightly.yml

@@ -21,8 +21,6 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: "22"
-          cache: "pnpm"
-          cache-dependency-path: pnpm-lock.yaml
       - name: Enable corepack + pin pnpm@9
         run: |
           corepack enable