diff --git a/.gitea/workflows/dev-deploy.yaml b/.gitea/workflows/dev-deploy.yaml
index bdbdd5d..0aa4bab 100644
--- a/.gitea/workflows/dev-deploy.yaml
+++ b/.gitea/workflows/dev-deploy.yaml
@@ -53,6 +53,11 @@ jobs:
         uses: pnpm/action-setup@v4
         with:
           version: 11.0.7
+          # Install pnpm into a per-job directory so concurrent jobs on
+          # the shared host runner do not race on the default
+          # `~/setup-pnpm` (the self-installer otherwise fails with
+          # `ENOTEMPTY` while cleaning a sibling job's install).
+          dest: ${{ runner.temp }}/setup-pnpm
 
       - name: Set up Node
         uses: actions/setup-node@v4
diff --git a/.gitea/workflows/prod-build.yaml b/.gitea/workflows/prod-build.yaml
index 4e54788..1f860c3 100644
--- a/.gitea/workflows/prod-build.yaml
+++ b/.gitea/workflows/prod-build.yaml
@@ -43,6 +43,11 @@ jobs:
         uses: pnpm/action-setup@v4
         with:
           version: 11.0.7
+          # Install pnpm into a per-job directory so concurrent jobs on
+          # the shared host runner do not race on the default
+          # `~/setup-pnpm` (the self-installer otherwise fails with
+          # `ENOTEMPTY` while cleaning a sibling job's install).
+          dest: ${{ runner.temp }}/setup-pnpm
 
       - name: Set up Node
         uses: actions/setup-node@v4
diff --git a/.gitea/workflows/ui-test.yaml b/.gitea/workflows/ui-test.yaml
index e78e722..6142c50 100644
--- a/.gitea/workflows/ui-test.yaml
+++ b/.gitea/workflows/ui-test.yaml
@@ -44,6 +44,11 @@ jobs:
         uses: pnpm/action-setup@v4
         with:
           version: 11.0.7
+          # Install pnpm into a per-job directory so concurrent jobs on
+          # the shared host runner do not race on the default
+          # `~/setup-pnpm` (the self-installer otherwise fails with
+          # `ENOTEMPTY` while cleaning a sibling job's install).
+          dest: ${{ runner.temp }}/setup-pnpm
 
       - name: Set up Node
         uses: actions/setup-node@v4