github: align tests job with LXD's

Signed-off-by: Simon Deziel <simon.deziel@canonical.com>

.github/workflows/tests.yml

@@ -5,13 +5,22 @@ on:
       - main
   pull_request:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+defaults:
+  run:
+    # Make sure bash is always invoked with `-eo pipefail`
+    # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsshell
+    shell: bash
+
 jobs:
   code-tests:
-    name: Code tests
+    name: Code
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
@@ -93,7 +102,7 @@ jobs:
           ssh-keyscan git.launchpad.net >> ~/.ssh/known_hosts
           ssh-keygen -qlF git.launchpad.net | grep -xF 'git.launchpad.net RSA SHA256:UNOzlP66WpDuEo34Wgs8mewypV0UzqHLsIFoqwe8dYo'
 
-      - name: Install Go
+      - name: Install Go (${{ matrix.go }})
         uses: actions/setup-go@v5
         with:
           go-version: 1.22.x