GitHub workflows: Add Coverity Scan and refactoring

.github/workflows/build-and-tests.yml

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+name: CMake Build And Tests
+
+on:
+  pull_request:
+    branches: [ "main" ]
+  workflow_dispatch:
+    inputs:
+      build_type:
+        description: 'Build type (e.g., Debug, Release)'
+        required: true
+        default: 'Release'
+
+jobs:
+  prepare:
+    uses: ./.github/workflows/build-prepare.yml
+    with:
+      build_type: ${{ inputs.build_type }}
+
+  build:
+    runs-on: ubuntu-24.04
+    needs: prepare
+    steps:
+    - name: Build
+      run: cmake --build build --config ${{ inputs.build_type }}
+
+    - name: Tests
+      working-directory: ${{ github.workspace }}/build
+      run: ctest -V --test-dir test

.github/workflows/build-prepare.yml

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+# This reusable workflow prepares the build environment and can be invoked by other workflows.
+name: CMake Build Prepare
+
+on:
+  workflow_call:
+    inputs:
+      build_type:
+        type: string
+        required: true
+        description: 'Type of the build. Default is Release.'
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install Dependencies
+      run: sudo apt install libgmock-dev libgtest-dev libyaml-cpp-dev swig -y
+
+    - name: Configure
+      run: cmake -B build -DCMAKE_BUILD_TYPE=${{ inputs.build_type }}

.github/workflows/coverity-scan.yml

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+name: Coverity Scan
+
+on:
+  workflow_dispatch:
+    inputs:
+      build_type:
+        description: 'Build type (e.g., Debug, Release)'
+        required: true
+        default: 'Release'
+
+jobs:
+  prepare:
+    uses: ./.github/workflows/build-prepare.yml
+    with:
+      build_type: ${{ inputs.build_type }}
+
+  coverity-scan:
+    runs-on: ubuntu-24.04
+    needs: prepare
+    env:
+      COVERITY_TOKEN: ${{ secrets.COVERITY_TOKEN }}
+    steps:
+    - name: Set up Coverity Scan
+      run: |
+        wget https://scan.coverity.com/download/linux64 --post-data "token=${COVERITY_TOKEN}&project=rpm-software-management%2Flibpkgmanifest" -O coverity_tool.tgz
+        tar -xzvf coverity_tool.tgz
+
+    - name: Build with Coverity
+      run: |
+        cd ${{ github.workspace }}/build
+        ../cov-analysis-*/bin/cov-build --dir cov-int make -j$(nproc)
+
+    - name: Upload Coverity results
+      run: |
+        tar czvf cov-int.tgz cov-int
+        curl --form token=${COVERITY_TOKEN} \
+             --form [email protected] \
+             --form [email protected] \
+             --form version=`git log --oneline -1 | awk '{ print $1;}'` \
+             --form description="libpkgmanifest - Library for working with RPM manifests" \
+             https://scan.coverity.com/builds?project=rpm-software-management%2Flibpkgmanifest