Refactor simple-ca: Remove JSON config and streamline AIA URL handling

- Removed the JSON configuration structure and related functions.
- Introduced plain text file for AIA base URL management.
- Updated CA and certificate creation functions to directly read/write AIA URL.
- Simplified CA bundle rebuilding logic by directly reading subdirectories.
- Enhanced test coverage for CA and certificate creation, including PFX generation.
- Adjusted test cases to reflect changes in directory structure and file handling.

.gitea/workflows/test.yaml

@@ -5,6 +5,7 @@ on:
       - 'simple-ca.py'
       - 'run-tests.sh'
       - 'test_simple_ca.py'
+      - 'src/simple-ca/**'
       - '.gitea/workflows/test.yaml'
 
 jobs:
@@ -33,3 +34,18 @@ jobs:
 
       - name: Run shell tests
         run: bash run-tests.sh
+
+  test-go:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - name: Run Go tests
+        run: go test -v ./...
+        working-directory: src/simple-ca