ci: run make in parallel where applicable

Do so when the output of the given job is not important.

For example, when the output of another job can be used for debugging
build-related issues.

.github/workflows/codeql-analysis.yml

@@ -68,21 +68,11 @@ jobs:
       with:
         languages: cpp
 
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@5b6282e01c62d02e720b81eb8a51204f527c3624
+    - name: configure
+      run: ./configure
 
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
+    - name: make
+      run: make -j "$(nproc)"
 
     - name: Perform CodeQL Analysis
       uses: github/codeql-action/analyze@5b6282e01c62d02e720b81eb8a51204f527c3624

.github/workflows/test.yml

@@ -73,7 +73,7 @@ jobs:
         --enable-analyzer --enable-apparmor --enable-selinux
         || (cat config.log; exit 1)
     - name: make
-      run: make
+      run: make -j "$(nproc)"
     - name: make install
       run: sudo make install
     - name: print firejail version