Tighten engines and devEngines

`engines` requires `node` version `>=22.11.0` instead of `>=22`,
while `22.11.0` is first long term support minor version of this major version.

`devEngines` requires `node` version `^22.11.0 || ^24.11.0` instead
of `22.x || 24.x`, while `22.11.0`  and `24.11.0` are first long term support
minor versions of those major versions. `devEngines` now requires `npm` version
`^11.6.1` as it is first `npm` version delivered by `node` in version `24.11.0`.
We require single major version of `npm` to generate `package-lock.json`
of compatible structure. This would not be possible without requiring
specific version of `npm`.

Author: bedrich-schindler

.github/workflows/build.yml

@@ -2,13 +2,34 @@ name: Build
 
 on: [ pull_request ]
 
+env:
+  NODE_ACTIVE_LTS_VERSION: 24
+  NODE_PREVIOUS_LTS_VERSION: 22
+  NPM_VERSION: 11
+
 jobs:
+  prepare_env:
+    name: Prepare environment
+    runs-on: ubuntu-24.04
+    outputs:
+      NODE_ACTIVE_LTS_VERSION: ${{ env.NODE_ACTIVE_LTS_VERSION }}
+      NODE_PREVIOUS_LTS_VERSION: ${{ env.NODE_PREVIOUS_LTS_VERSION }}
+      NPM_VERSION: ${{ env.NPM_VERSION }}
+    steps:
+      - name: Compute outputs
+        run: |
+          echo "NODE_ACTIVE_LTS_VERSION=${{ env.NODE_ACTIVE_LTS_VERSION }}" >> $GITHUB_OUTPUT
+          echo "NODE_PREVIOUS_LTS_VERSION=${{ env.NODE_PREVIOUS_LTS_VERSION }}" >> $GITHUB_OUTPUT
+          echo "NPM_VERSION=${{ env.NPM_VERSION }}" >> $GITHUB_OUTPUT
   build:
     name: Build distribution CSS and JS
     runs-on: ubuntu-24.04
+    needs: prepare_env
     strategy:
       matrix:
-        node: [ 22, 24 ]
+        node:
+          - ${{ needs.prepare_env.outputs.NODE_ACTIVE_LTS_VERSION }}
+          - ${{ needs.prepare_env.outputs.NODE_PREVIOUS_LTS_VERSION }}
     steps:
       - name: Clone repository
         uses: actions/checkout@v6
@@ -18,19 +39,19 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
           cache: npm
-        if: matrix.node != 22
+        if: matrix.node == env.NODE_ACTIVE_LTS_VERSION
 
       - name: Set up Node.js ${{ matrix.node }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node }}
           cache: npm
-        if: matrix.node == 22
+        if: matrix.node == env.NODE_PREVIOUS_LTS_VERSION
         continue-on-error: true
 
       - name: Install npm@11 for Node.js ${{ matrix.node }}
-        run: npm install npm@11
-        if: matrix.node == 22
+        run: npm install -g npm@${{ env.NPM_VERSION }}
+        if: matrix.node == env.NODE_PREVIOUS_LTS_VERSION
 
       - name: Print Node.js and npm version
         run: node --version && npm --version