build.yml: -j4 with lin/win runners

https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories

.github/workflows/build.yml

@@ -14,7 +14,7 @@ on:
 env:
   REMOVE_BUNDLED_PACKAGES : sudo rm -rf /usr/local
   BUILD_DEFAULT_LINUX: |
-        cmake -S . -B build -D ARCH="default" -D BUILD_TESTS=ON -D CMAKE_BUILD_TYPE=Release && cmake --build build -j3
+        cmake -S . -B build -D ARCH="default" -D BUILD_TESTS=ON -D CMAKE_BUILD_TYPE=Release && cmake --build build -j4
   APT_INSTALL_LINUX: 'sudo apt -y install build-essential cmake libboost-all-dev miniupnpc libunbound-dev graphviz doxygen libunwind8-dev pkg-config libssl-dev libzmq3-dev libsodium-dev libhidapi-dev libnorm-dev libusb-1.0-0-dev libpgm-dev libprotobuf-dev protobuf-compiler ccache'
   APT_SET_CONF: |
         echo "Acquire::Retries \"3\";"         | sudo tee -a /etc/apt/apt.conf.d/80-custom
@@ -72,7 +72,7 @@ jobs:
     - name: build
       run: |
         ${{env.CCACHE_SETTINGS}}
-        make release-static-win64 -j2
+        make release-static-win64 -j4
 
 # See the OS labels and monitor deprecations here:
 # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
@@ -131,7 +131,7 @@ jobs:
       run: |
         ${{env.CCACHE_SETTINGS}}
         cmake .
-        make wallet_api -j3
+        make wallet_api -j4
 
   test-ubuntu:
     needs: build-ubuntu