CI: Add RISC-V runners to base CI (via RISE project)

The RISE project now provides free RISV-V Github runners, see
https://riseproject-dev.github.io/riscv-runner/
This commit adds them to the base CI.

Signed-off-by: Matthias J. Kannwischer <matthias@zerorisc.com>

Author: mkannwischer

.github/workflows/base.yml

@@ -34,6 +34,9 @@ jobs:
            name: 'aarch64'
          - runner: ubuntu-latest
            name: 'x86_64'
+         # via https://riseproject-dev.github.io/riscv-runner/
+         - runner: ubuntu-24.04-riscv
+           name: 'riscv'
          - runner: macos-latest
            name: 'macos (aarch64)'
          - runner: macos-15-intel
@@ -68,6 +71,9 @@ jobs:
            name: 'aarch64'
          - runner: ubuntu-latest
            name: 'x86_64'
+         # via https://riseproject-dev.github.io/riscv-runner/
+         - runner: ubuntu-24.04-riscv
+           name: 'riscv'
         acvp-version: [v1.1.0.39, v1.1.0.40, v1.1.0.41]
         exclude:
           - {external: true,
@@ -140,6 +146,9 @@ jobs:
            name: 'aarch64'
          - runner: ubuntu-latest
            name: 'x86_64'
+         # via https://riseproject-dev.github.io/riscv-runner/
+         - runner: ubuntu-24.04-riscv
+           name: 'riscv'
         exclude:
           - {external: true,
              target: {
@@ -304,6 +313,9 @@ jobs:
            name: 'aarch64'
          - runner: ubuntu-latest
            name: 'x86_64'
+         # via https://riseproject-dev.github.io/riscv-runner/
+         - runner: ubuntu-24.04-riscv
+           name: 'riscv'
     name: scan-build (${{ matrix.target.name }})
     runs-on: ${{ matrix.target.runner }}
     steps: