fix(ci): trim two pieces of per-PR work that buy nothing (#11219)

Measured over the week to 2026-07-30, 97% of CI wall-clock is queueing and 3%
is execution: a median 5-hour queue against a 4-20 minute median job. With the
queue saturated, throughput is concurrency divided by service time, so cutting
execution time raises the drain rate directly. Two steps stood out as paying
nothing for what they cost.

test.yml: drop the free-disk-space step (~3.1min per run, ~22 h/week). That
action exists to make room for docker buildx layers and this job runs no buildx
step. It was also sized for a `make test` that downloaded multi-GB GGUF/whisper
fixtures and built llama-cpp/whisper/stablediffusion-ggml; the test-suite reorg
moved all of that into tests/e2e-backends and tests/e2e-aio, as the Makefile
test target already records. Its tool-cache:true wipe was additionally deleting
/opt/hostedtoolcache, forcing setup-go and setup-node to re-download toolchains
that ship preinstalled on the runner.

build-test.yaml: build only the host target on pull_request. The three-platform
cross-compile (linux/amd64, linux/arm64, darwin/arm64) is the bulk of that job's
~6.6min median, ~47 h/week, and nothing consumes a PR's binaries. goreleaser's
--single-target still runs every before-hook (protogen-go, react-ui, go mod
tidy), so the "is the release build broken" signal is unchanged. master pushes
and tags keep building all three.

Also record why the Linux Go workflows pass cache: false to actions/setup-go,
since it reads as an oversight and is not. Set up Go has a median of 11 seconds
on those runners, so there is nothing to win, and the repo already sits at
GitHub's 10 GB Actions cache ceiling with 31 entries, where each setup-go entry
is 222-375 MB on Linux and up to 1.4 GB on macOS. Re-enabling it would evict
something that is earning its space.


Assisted-by: Claude:opus-5 [claude-code]

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

.github/workflows/build-test.yaml

@@ -35,9 +35,15 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: 1.25
+      # A PR builds only the host target. The three-platform cross-compile
+      # (linux/amd64, linux/arm64, darwin/arm64) is the bulk of this job's
+      # ~6.6min median and no PR consumes the resulting binaries. The
+      # before-hooks (protogen-go, react-ui, go mod tidy) run either way, so the
+      # "is the release build broken" signal is unchanged. master and tags still
+      # build everything.
       - name: Run GoReleaser
         run: |
-          make dev-dist
+          make ${{ github.event_name == 'pull_request' && 'dev-dist-single' || 'dev-dist' }}
   launcher-build-darwin:
     runs-on: macos-latest
     steps:

.github/workflows/test.yml

@@ -24,8 +24,13 @@ jobs:
         uses: actions/checkout@v7
         with:
           submodules: true
-      - name: Free disk space
-        uses: ./.github/actions/free-disk-space
+      # No free-disk-space step here on purpose. That action exists to make room
+      # for docker buildx layers, and this job runs no buildx step. It was also
+      # sized for a `make test` that downloaded multi-GB GGUF/whisper fixtures
+      # and built llama-cpp/whisper/stablediffusion-ggml; after the test-suite
+      # reorg it does neither (see the Makefile test target). It cost ~3min of
+      # every run, and its tool-cache:true wipe also forced setup-go and
+      # setup-node to re-download toolchains that ship preinstalled.
       - name: Setup Go ${{ matrix.go-version }}
         uses: actions/setup-go@v5
         with: