Add offline tests workflow and clean up SonarQube config

Introduce a new offline tests workflow to validate Go code across multiple OS and Go versions. This commit also removes unused environment variables and updates the Go version syntax in the SonarQube workflow.

.github/workflows/offline-tests.yml

@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: Offline tests workflow
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/**'
+      - 'codecov.yml'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '**.go'
+      - 'go.*'
+      - '.github/**'
+      - 'codecov.yml'
+permissions:
+  contents: read
+
+jobs:
+  run:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: ['1.19', '1.20', '1.21', '1.22', '1.23']
+    steps:
+    - name: Harden Runner
+      uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
+      with:
+        egress-policy: audit
+
+    - name: Checkout Code
+      uses: actions/checkout@61b9e3751b92087fd0b06925ba6dd6314e06f089 # master
+    - name: Setup go
+      uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+      with:
+        go-version: ${{ matrix.go }}
+    - name: Run Tests
+      run: |
+        go test -race -shuffle=on ./...

.github/workflows/sonarqube.yml

@@ -14,17 +14,6 @@ on:
   pull_request:
     branches:
       - main # or the name of your main branch
-env:
-  TEST_HOST: ${{ secrets.TEST_HOST }}
-  TEST_FROM: ${{ secrets.TEST_USER }}
-  TEST_ALLOW_SEND: "1"
-  TEST_SMTPAUTH_USER: ${{ secrets.TEST_USER }}
-  TEST_SMTPAUTH_PASS: ${{ secrets.TEST_PASS }}
-  TEST_SMTPAUTH_TYPE: "LOGIN"
-  TEST_ONLINE_SCRAM: "1"
-  TEST_HOST_SCRAM: ${{ secrets.TEST_HOST_SCRAM }}
-  TEST_USER_SCRAM: ${{ secrets.TEST_USER_SCRAM }}
-  TEST_PASS_SCRAM: ${{ secrets.TEST_PASS_SCRAM }}
 jobs:
   build:
     name: Build
@@ -42,7 +31,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
         with:
-          go-version: '1.23.x'
+          go-version: '1.23'
           
       - name: Run unit Tests
         run: |