ci: run on node:25 with mise bootstrapped in-step

act_runner needs node in the image for JS actions, so use the official
node image and let mise install pnpm from mise.toml at job start;
avoids maintaining a custom image.

.gitea/workflows/build.yaml

@@ -12,16 +12,20 @@ jobs:
   build:
     runs-on: archlinux
     container:
-      image: gitea.chaosdev.gay/lucasoskorep/mise-node:2026.10.19
+      image: node:25
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Install tools
+      - name: Install pnpm via mise
         run: |
+          curl -fsSL https://mise.run | sh
+          export PATH="$HOME/.local/bin:$PATH"
           mise trust
-          mise install
+          mise install pnpm
+          mise reshim
+          echo "$HOME/.local/share/mise/shims" >> "$GITHUB_PATH"
           npm install -g typescript@5.8.3
 
       - name: Install just
@@ -56,17 +60,12 @@ jobs:
     environment:
       name: production
     container:
-      image: gitea.chaosdev.gay/lucasoskorep/mise-node:2026.10.19
+      image: node:25
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Install tools
-        run: |
-          mise trust
-          mise install
-
       - name: Download artifact
         uses: actions/download-artifact@v3
         with: