chore: improve actions performance and security practices (#5970)

* chore: bump actions and pin versions

* build: switch to blacksmith

* fix: use rust-toolchain stable

* build: improve pnpm store caching

* chore: remove emoji from workflows

* fix: run prepare job on blacksmith

* chore: kebab case id

* build: add concurrency groups to limit duplicate jobs

* build: switch around node setup and pnpm setup task

* chore: bump to nodejs 24, fix pnpm caching

* fix: enable corepack

* fix: concurrency deadlock in frontend preview

* fix: approve build scripts

* fix: just don't cancel concurrent previews

* build: remove pnpm setup action everywhere

* build: cache apt packages

* build: yet another attempt at fixing concurrency

* build: lower runner type for frontend deploy

* fix: eslint not existing

* build: add sccache to turbo-ci

* fix: correct nextest pkg

* fix: turbo ignoring sccache

* revert me: test labrinth tests

* Revert "revert me: test labrinth tests"

This reverts commit def5cc19183d5c0fe3b6f3c03635d73bb59bd312.

* build: compile app before docker build

* build: lower runner types

* build: remove docker inline caching

* build: try mold on labrinth

* build: tweak labrinth prod build profile

* fix: app windows builds and caching

* fix: tombi format cargo.toml

* fix: swap ping test to cubecraft to avoid CI flakiness

* typos fix

---------

Co-authored-by: aecsocket <aecsocket@tutanota.com>

.github/workflows/prepare-pnpm-cache.yml

@@ -0,0 +1,40 @@
+name: Prepare pnpm cache
+
+on:
+  push:
+    paths:
+      - .github/workflows/prepare-pnpm-cache.yml
+      - package.json
+      - pnpm-lock.yaml
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' && github.ref != 'refs/heads/prod' }}
+
+jobs:
+  prepare:
+    runs-on: blacksmith-2vcpu-ubuntu-2404
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup Node
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version-file: .nvmrc
+
+      - name: Enable Corepack
+        run: corepack enable
+
+      - name: Get pnpm store path
+        id: pnpm-store
+        run: echo "store-path=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
+
+      - name: Cache pnpm
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        with:
+          path: ${{ steps.pnpm-store.outputs.store-path }}
+          key: pnpm-cache-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/pnpm-lock.yaml') }}
+
+      - name: Install dependencies
+        run: pnpm recursive install --frozen-lockfile