Merge pull request #16 from Sjors/2026/03/ccache

ci: use ccache

Author: rustaceanrob

.github/workflows/ci.yml

@@ -17,11 +17,20 @@ jobs:
       - name: Install Bitcoin Dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install build-essential cmake pkgconf python3 libevent-dev libboost-dev capnproto libcapnp-dev
+          sudo apt-get install build-essential cmake pkgconf python3 libevent-dev libboost-dev capnproto libcapnp-dev ccache
+      - name: ccache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/ccache
+          key: ccache-${{ runner.os }}-${{ github.sha }}
+          restore-keys: ccache-${{ runner.os }}-
       - name: Checkout Bitcoin Core
         run: git clone --depth 1 --branch master https://github.com/bitcoin/bitcoin.git
       - name: Build Bitcoin Core
-        run: cd bitcoin && cmake -B build -DENABLE_WALLET=OFF -DBUILD_TESTS=OFF && cmake --build build -j 16
+        run: |
+          cd bitcoin
+          cmake -B build -DENABLE_WALLET=OFF -DBUILD_TESTS=OFF -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+          cmake --build build -j $(nproc)
       - name: Run Bitcoin Core Daemon
         run: cd bitcoin && ./build/bin/bitcoin node -chain=regtest -ipcbind=unix -server -debug=ipc -daemon
       - name: Generate Blocks