[release-11.3.7] Backport workflow fixes (#104697)

* Copy workflows and actions from main

* add zizmor.yml

.github/actions/test-coverage-processor/action.yml

@@ -0,0 +1,50 @@
+name: 'Go Coverage Processor'
+description: 'Process Go test coverage files and generate reports'
+
+inputs:
+  test-type:
+    description: 'Type of test (e.g., be-unit, be-integration)'
+    required: true
+    type: string
+  coverage-file:
+    description: 'Path to the Go coverage file (.cov)'
+    required: true
+    type: string
+  codecov-token:
+    description: 'Token for CodeCov (required for CodeCov reporting)'
+    required: false
+    default: ''
+  codecov-flag:
+    description: 'Flag to categorize the upload to CodeCov'
+    required: false
+    default: ''
+  codecov-name:
+    description: 'Custom name for the upload to CodeCov'
+    required: false
+    default: ''
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Process Go coverage output
+      shell: bash
+      env:
+        COVERAGE_FILE: ${{ inputs.coverage-file }}
+      run: |
+        # Ensure valid coverage file even if empty
+        if [ ! -s "$COVERAGE_FILE" ]; then
+          echo "Coverage file is empty, creating a minimal valid file"
+          echo "mode: set" > "$COVERAGE_FILE"
+        fi
+
+    - name: Report coverage to CodeCov
+      uses: codecov/codecov-action@ad3126e916f78f00edff4ed0317cf185271ccc2d # v5
+      if: inputs.codecov-token != ''
+      with:
+        files: ${{ inputs.coverage-file }}
+        flags: ${{ inputs.codecov-flag || inputs.test-type }}
+        name: ${{ inputs.codecov-name || inputs.test-type }}
+        slug: grafana/grafana
+        # This URL doesn't use the Google auth, but is much more locked down. As such, it requires OIDC or a CodeCov-provided token to do anything.
+        url: https://codecov-webhook.grafana-dev.net
+        token: ${{ inputs.codecov-token }}