CI: Run scripts with predefined shell

It would be more portable to specify bash via shebang rather than
arbitrary 'sh' commands.

Author: jserv

.ci/riscv-toolchain-install.sh

@@ -9,9 +9,9 @@ jobs:
     - uses: actions/checkout@v4
     - name: install-dependencies
       run: |
-           sh .ci/riscv-toolchain-install.sh
+           .ci/riscv-toolchain-install.sh
       shell: bash
     - name: architectural test
       run: |
-            sh .ci/riscv-tests.sh
+           .ci/riscv-tests.sh
       shell: bash

.github/workflows/compliance.yml

@@ -11,7 +11,7 @@ jobs:
       run: |
             sudo apt-get update
             sudo apt-get install libsdl2-dev libsdl2-mixer-dev
-            sh .ci/riscv-toolchain-install.sh
+            .ci/riscv-toolchain-install.sh
       shell: bash
     - name: default build
       run: make