ci: stop building unused targets in the validate workflows (#3052)

* ci: stop building unused targets in the validate workflows

The llama.cpp and vLLM validate jobs built every CMake target; both only
need lemond (plus the CLI for sd.cpp/vLLM). Cache build/_deps in the three
validate jobs and drop the `Remove-Item build` that would have deleted the
restored cache.

- validate_llamacpp: all targets -> lemond, BUILD_WEB_APP=OFF, _deps cache
- validate_sdcpp: _deps cache, drop build/ wipe
- validate_vllm: all targets -> lemond lemonade, _deps cache
- actions/cache v4 -> v5 in the Windows embeddable job

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* ci: address review on the validate build caches

- vLLM: install build deps directly instead of ./setup.sh, whose
  "Preparing build directory" step rm -rf's the restored _deps cache
- share one _deps cache between the two Windows validate jobs rather
  than writing one each; the repo is near the 10 GB Actions cache cap
- add toolchain/runner-image markers and cmake/*.cmake to the cache keys
- verify build/lemonade in the vLLM build job
- finish the action-version bump in the Windows embeddable job

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Revert "ci: bump action versions in the Windows embeddable job"

The embeddable job neither builds validate targets nor shares a cache
with them, so the action-version bumps do not belong in this PR.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* ci: drop the _deps cache from the validate workflows

The warm-cache rerun showed it does not pay for itself: 2 of 3 jobs
missed even though the prior attempt had saved both keys 14 hours
earlier (the repo's Actions cache is at its 10 GB cap, so ~550 MB
entries are evicted within hours), and the job that did hit got slower.
Configure dominates these builds and reconfigures either way, leaving a
~30s ceiling on a 10-minute job.

Also reverts the two changes that only existed to protect the cache:
the `Remove-Item build` deletions and vLLM's direct apt-get install in
place of setup.sh.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: jeremyfowers

.github/workflows/validate_llamacpp.yml

@@ -376,15 +376,20 @@ jobs:
 
           $script | python -
 
-      - name: Build C++ Server with CMake
+      - name: Build lemond
         shell: PowerShell
         run: |
           $ErrorActionPreference = "Stop"
           Write-Host "Building Lemonade server binaries..." -ForegroundColor Cyan
           if (Test-Path "build") { Remove-Item -Recurse -Force "build" }
-          cmake --preset vs18
+          # The validation drives lemond over HTTP and never invokes the CLI,
+          # so lemond is the only target it needs.
+          cmake --preset vs18 -DBUILD_WEB_APP=OFF
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
-          cmake --build build --config Release
+          # /m:2 goes straight to MSBuild rather than through --parallel, which
+          # makes CMake set CL_MPCount=1 and cancel the /MP in CMakeLists.txt.
+          # Capped at 2 because /MP already spawns one cl.exe per core.
+          cmake --build build --config Release --target lemond -- /m:2
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
           if (-not (Test-Path "build\Release\lemond.exe")) {
               Write-Host "ERROR: lemond.exe not found!" -ForegroundColor Red
@@ -628,7 +633,7 @@ jobs:
                 )
               }
           )
-  
+
           foreach ($process in $staleProcesses) {
             Write-Host "Stopping stale $($process.Name) PID $($process.ProcessId)." `
               -ForegroundColor Yellow
@@ -642,7 +647,7 @@ jobs:
               }
             }
           }
-  
+
       - uses: actions/checkout@v5
         with:
           clean: true
@@ -831,7 +836,7 @@ jobs:
           if ($validationExitCode -ne 0) {
             exit $validationExitCode
           }
-  
+
       - name: Upload results
         if: always()
         uses: actions/upload-artifact@v7

.github/workflows/validate_sdcpp.yml

@@ -231,15 +231,20 @@ jobs:
             --release "${{ needs.discover-release.outputs.cuda_release }}" `
             --backends "${{ needs.discover-release.outputs.cuda_update_backends }}"
 
-      - name: Build C++ Server with CMake
+      - name: Build lemond and the CLI
         shell: PowerShell
         run: |
           $ErrorActionPreference = "Stop"
           Write-Host "Building Lemonade server binaries..." -ForegroundColor Cyan
           if (Test-Path "build") { Remove-Item -Recurse -Force "build" }
-          cmake --preset vs18
+          # BUILD_WEB_APP=OFF skips the configure-time CONFIGURE_DEPENDS glob
+          # over src/app; the web-app target is not in this build graph anyway.
+          cmake --preset vs18 -DBUILD_WEB_APP=OFF
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
-          cmake --build build --config Release --target lemond lemonade
+          # /m:2 goes straight to MSBuild rather than through --parallel, which
+          # makes CMake set CL_MPCount=1 and cancel the /MP in CMakeLists.txt.
+          # Capped at 2 because /MP already spawns one cl.exe per core.
+          cmake --build build --config Release --target lemond lemonade -- /m:2
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
           if (-not (Test-Path "build\Release\lemond.exe")) {
               Write-Host "ERROR: lemond.exe not found!" -ForegroundColor Red

.github/workflows/validate_vllm.yml

@@ -86,14 +86,15 @@ jobs:
           print(f"vllm.rocm: {old} -> {release}")
           PY
 
-      - name: Build Lemonade server
+      - name: Build lemond and the CLI
         run: |
           set -e
           ./setup.sh
           # Skip the web app; CI only exercises the backend.
           cmake -DBUILD_WEB_APP=OFF --preset default
-          cmake --build --preset default
+          cmake --build --preset default --target lemond lemonade
           test -f build/lemond || { echo "lemond not found!"; exit 1; }
+          test -f build/lemonade || { echo "lemonade not found!"; exit 1; }
           echo "Build successful!"
 
       - name: Upload build artifacts