Fix pnpm cache: use inline export instead of workflow env block

act_runner v0.3.0 doesn't propagate workflow-level or job-level
env: blocks to job containers. Use export in run commands instead.
First run warms cache, subsequent runs will show reused packages.

.gitea/workflows/deploy-production.yaml

@@ -10,10 +10,6 @@ on:
         required: false
         default: ""
 
-env:
-  PNPM_STORE_DIR: /pnpm-store
-  COREPACK_HOME: /pnpm-store/.corepack
-
 jobs:
   deploy:
     runs-on: ubuntu-latest
@@ -22,9 +18,15 @@ jobs:
         with:
           fetch-depth: 2
 
-      - run: corepack enable && corepack prepare pnpm@latest --activate
+      - name: Setup pnpm
+        run: |
+          export COREPACK_HOME=/pnpm-store/.corepack
+          corepack enable && corepack prepare pnpm@latest --activate
 
-      - run: pnpm install --frozen-lockfile
+      - name: Install dependencies
+        run: |
+          export PNPM_STORE_DIR=/pnpm-store
+          pnpm install --frozen-lockfile
 
       - name: Determine changed apps
         id: changes