build.yml: drop Node.js-dependent actions (cache, upload-artifact)

The runner image (golang:*) ships without Node.js, and actions/cache@v4
plus actions/upload-artifact@v4 transitively need it for hashFiles +
artifact upload. Verified by CI failure on first push (run #1, task 710):
"OCI runtime exec failed ... 'node': executable file not found in $PATH".

For now we accept ~20-30s of go module download per run (small project,
fine). Real release artifacts go via release.yml (next task) which will
use curl + Forgejo REST API to upload — pure bash, no Node needed.

Drop the smoke-build artifact upload too — it was only for inspection
during dev. Add `./bin/drover --version` to the linux smoke build so we
get exit-code verification that the CLI bootstraps correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.forgejo/workflows/build.yml

@@ -17,6 +17,12 @@ concurrency:
   group: build-${{ github.ref }}
   cancel-in-progress: true
 
+# We deliberately avoid actions/cache@v4 and actions/upload-artifact@v4 in this
+# workflow. They are Node.js-based and the runner image (golang:*) has no Node.
+# Installing Node would add ~10s per job for every run; for now we accept
+# that go module downloads happen on each invocation (~20-30s once warm).
+# Real release artifacts are produced by release.yml via curl + Forgejo API.
+
 jobs:
   test:
     runs-on: go
@@ -26,14 +32,6 @@ jobs:
           git clone --no-checkout "https://forgejo-runner:${GITHUB_TOKEN}@git.okcu.io/${GITHUB_REPOSITORY}.git" /tmp/src
           git -C /tmp/src checkout "$GITHUB_SHA"
           cp -a /tmp/src/. .
-      - name: Cache Go modules
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ runner.os }}-go-
       - name: Vet
         run: go vet ./...
       - name: Test with race
@@ -42,6 +40,7 @@ jobs:
         run: |
           mkdir -p bin
           go build -trimpath -ldflags="-s -w" -o bin/drover ./cmd/drover
+          ./bin/drover --version
 
   build-windows:
     runs-on: go
@@ -52,14 +51,6 @@ jobs:
           git clone --no-checkout "https://forgejo-runner:${GITHUB_TOKEN}@git.okcu.io/${GITHUB_REPOSITORY}.git" /tmp/src
           git -C /tmp/src checkout "$GITHUB_SHA"
           cp -a /tmp/src/. .
-      - name: Cache Go modules
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ runner.os }}-go-
       - name: Cross-compile drover.exe (windows/amd64)
         env:
           GOOS: windows
@@ -75,9 +66,4 @@ jobs:
             -X main.BuildDate=${BUILD_DATE}" \
             -o bin/drover.exe ./cmd/drover
           ls -la bin/
-      - name: Upload artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: drover-windows-amd64-${{ github.sha }}
-          path: bin/drover.exe
-          retention-days: 14
+          sha256sum bin/drover.exe