fix: unblock GitHub Actions runner selection and workflow lint

Author: binarylogic

.github/workflows/_go-checks.yaml

@@ -6,7 +6,7 @@ on:
       runner:
         description: Cirrus runner image
         required: false
-        default: ghcr.io/cirruslabs/ubuntu-runner-amd64:24.04-sm
+        default: ubuntu-latest
         type: string
 
 jobs:

.github/workflows/release.yml

@@ -75,8 +75,8 @@ jobs:
       - name: Create checksums
         working-directory: artifacts
         run: |
-          cat *.sha256 > checksums.txt
-          rm *.sha256
+          cat ./*.sha256 > checksums.txt
+          rm ./*.sha256
 
       - name: Upload release assets
         env: