Add riscv64 nightly LKL build to GitHub Action

Previously, the GitHub Actions only build LKL of x86_64 and
aarch64 architectures. This adds the riscv64 support by using
the RISE GitHub App to do the compilation.

This is needed by the riscv64 support of kbox in the future.

Change-Id: I7f710891f8259c8ec848891453e1f6410e932a82

Author: rota1001

.github/workflows/build-lkl.yml

@@ -6,7 +6,7 @@
 # successful publish.
 #
 # The lkl-nightly release on sysprog21/kbox always contains exactly
-# one x86_64 and one aarch64 tarball (the latest build).
+# one x86_64, one aarch64 tarball and one riscv64 (the latest build).
 name: Build LKL (nightly)
 
 on:
@@ -75,7 +75,7 @@ jobs:
             echo "New upstream commit: ${CURRENT} (was: ${LAST_COMMIT:-none})"
           fi
 
-  # ---- Build x86_64 and aarch64 in parallel ----
+  # ---- Build x86_64, aarch64 and riscv64 in parallel ----
   build:
     needs: check-upstream
     if: needs.check-upstream.outputs.needs_build == 'true'
@@ -89,8 +89,10 @@ jobs:
             runner: ubuntu-24.04
           - arch: aarch64
             runner: ubuntu-24.04-arm
+          - arch: riscv64
+            runner: ubuntu-24.04-riscv
     runs-on: ${{ matrix.runner }}
-    timeout-minutes: 30
+    timeout-minutes: 360
     steps:
       - name: Checkout
         uses: actions/checkout@v6
@@ -114,7 +116,7 @@ jobs:
 
       - name: Package
         run: |
-          tar czf liblkl-${{ matrix.arch }}.tar.gz lkl-${{ matrix.arch }}/
+          tar czf liblkl-${{ matrix.arch }}.tar.gz -C lkl-${{ matrix.arch }}/ .
 
       - name: Upload artifact
         uses: actions/upload-artifact@v7
@@ -151,7 +153,7 @@ jobs:
           date=${BUILD_DATE}
           upstream=https://github.com/${{ env.LKL_UPSTREAM }}/commit/${LKL_COMMIT}
 
-          Contains: liblkl-x86_64.tar.gz, liblkl-aarch64.tar.gz
+          Contains: liblkl-x86_64.tar.gz, liblkl-aarch64.tar.gz, liblkl-riscv64.tar.gz
           Each tarball includes: liblkl.a, lkl.h, autoconf.h, vmlinux-gdb.py,
           BUILD_INFO, sha256sums.txt
           EOF
@@ -168,4 +170,5 @@ jobs:
             --notes-file /tmp/release-notes.md \
             --prerelease \
             dist/liblkl-x86_64.tar.gz \
-            dist/liblkl-aarch64.tar.gz
+            dist/liblkl-aarch64.tar.gz \
+            dist/liblkl-riscv64.tar.gz

scripts/common.sh

@@ -67,6 +67,7 @@ detect_arch()
     case "${1:-$(uname -m)}" in
         x86_64 | amd64) ARCH="x86_64" ;;
         aarch64 | arm64) ARCH="aarch64" ;;
+        riscv64) ARCH="riscv64" ;;
         *) die "unsupported architecture: ${1:-$(uname -m)}" ;;
     esac
 }