Have shellcheck check all scripts in ci

Author: tnull

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
         if: "matrix.platform == 'ubuntu-latest'"
         run: |
           sudo apt-get -y install shellcheck
-          shellcheck ci/ci-tests.sh
+          shellcheck ci/*.sh -aP ci
       - name: Set RUSTFLAGS to deny warnings
         if: "matrix.toolchain == '1.63.0'"
         run: echo "RUSTFLAGS=-D warnings" >> "$GITHUB_ENV"