CI: fix CodeQL LevelDB C++20 build, Windows DLL path, docs flags

CodeQL: switch from Debug to Release to avoid Conan rebuilding
LevelDB 1.23 which has a std::memory_order scoped enum bug in C++20.
Share Conan cache with build.yml for faster runs.

Windows: copy DLL next to exe (not just lib/) for portable ZIP —
Windows DLL search only checks the exe's directory.

Docs: add missing --embedded-ltc --embedded-doge flags to Linux
running examples.

Author: frstrtr

.github/workflows/build.yml

@@ -220,6 +220,9 @@ jobs:
           $PKG = "c2pool-${VERSION}-windows-x86_64"
           New-Item -ItemType Directory -Path "${PKG}/lib","${PKG}/config","${PKG}/web-static","${PKG}/explorer" -Force
           Copy-Item build_ci/src/c2pool/Release/c2pool.exe "${PKG}/"
+          # DLL must be next to exe for Windows DLL search path (portable ZIP)
+          # Also copy to lib/ for Inno Setup installer compatibility
+          Copy-Item "${env:GITHUB_WORKSPACE}/secp256k1/bin/libsecp256k1-6.dll" "${PKG}/"
           Copy-Item "${env:GITHUB_WORKSPACE}/secp256k1/bin/libsecp256k1-6.dll" "${PKG}/lib/"
           Copy-Item start.bat "${PKG}/"
           Copy-Item -Recurse web-static/* "${PKG}/web-static/"

.github/workflows/codeql-analysis.yml

@@ -67,24 +67,24 @@ jobs:
         uses: actions/cache@v5
         with:
           path: ~/.conan2
-          key: conan2-codeql-ubuntu24-gcc13-debug-${{ hashFiles('conanfile.txt') }}
-          restore-keys: |
-            conan2-codeql-ubuntu24-gcc13-debug-
+          # Share cache with build.yml (same Release profile)
+          key: conan2-ubuntu24-gcc13-${{ hashFiles('conanfile.txt') }}
+          restore-keys: conan2-ubuntu24-gcc13-
 
       - if: matrix.build-mode == 'manual'
         name: Install Conan dependencies
         run: |
           conan install . \
             --build=missing \
             --output-folder=build_codeql \
-            --settings=build_type=Debug
+            --settings=build_type=Release
 
       - if: matrix.build-mode == 'manual'
         name: Build for CodeQL analysis
         run: |
           cmake -S . -B build_codeql \
             -DCMAKE_TOOLCHAIN_FILE=build_codeql/conan_toolchain.cmake \
-            -DCMAKE_BUILD_TYPE=Debug
+            -DCMAKE_BUILD_TYPE=Release
           cmake --build build_codeql --target c2pool -j$(nproc)
 
       # ── Analysis ──────────────────────────────────────────────────────────

doc/build-unix.md

@@ -158,7 +158,7 @@ The default mode uses embedded LTC and DOGE SPV nodes. No litecoind or
 dogecoind installation needed.
 
 ```bash
-./build/src/c2pool/c2pool --integrated --net litecoin --dashboard-dir web-static
+./build/src/c2pool/c2pool --integrated --net litecoin --embedded-ltc --embedded-doge --dashboard-dir web-static
 ```
 
 - Dashboard: `http://localhost:8080`
@@ -171,6 +171,7 @@ If you run a local litecoind, add it as a priority peer for faster sync:
 
 ```bash
 ./build/src/c2pool/c2pool --integrated --net litecoin \
+    --embedded-ltc --embedded-doge \
     --dashboard-dir web-static \
     --coind-p2p-port 9333
 ```