Add external dependencies CI/CD pipelines with SBOM generation

- Create external-dependencies directory structure with per-package pipelines
- Add DEPENDENCIES-INVENTORY.md with comprehensive dependency tracking
- Create ubuntu-26.04-build-container base image with all dependencies
- Add per-package Jenkinsfiles: log4qt, grantlee, googletest, postgresql, qt6-framework, kdreports
- Add SBOM generation script (generate-sbom.sh) for CycloneDX, SLSA v1.0, and license reports
- Integrate SBOM generation into all Jenkins pipelines
- Add external-dependencies/README.md with usage and security documentation
- Exclude proprietary license files (rti_license.dat) from git tracking

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Entire-Checkpoint: 01M6KNFNMSPW4SY4J4SQTTPVBP

external-dependencies/googletest/Dockerfile

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+# GoogleTest Installation
+FROM harbor.sl.defence-elec.de/proxydockerhub/library/ubuntu:26.04
+
+LABEL maintainer="Legatus Team"
+LABEL description="GoogleTest testing framework"
+LABEL version="1.15.2"
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+ARG HTTP_PROXY=""
+ARG HTTPS_PROXY=""
+ARG NO_PROXY="localhost,127.0.0.1,.sl.defence-elec.de"
+
+ENV http_proxy=${HTTP_PROXY}
+ENV https_proxy=${HTTPS_PROXY}
+ENV no_proxy=${NO_PROXY}
+
+ARG GTEST_VERSION=1.15.2
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential cmake git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Clone and build GoogleTest
+RUN git clone --depth 1 --branch v${GTEST_VERSION} \
+    https://github.com/google/googletest.git /tmp/googletest \
+    && cd /tmp/googletest \
+    && mkdir build && cd build \
+    && cmake -DCMAKE_BUILD_TYPE=Release \
+             -DCMAKE_INSTALL_PREFIX=/usr/local \
+             -DBUILD_SHARED_LIBS=ON \
+             .. \
+    && cmake --build . -j$(nproc) \
+    && cmake --install . \
+    && rm -rf /tmp/googletest
+
+# Update library cache
+RUN ldconfig
+
+# Verify installation
+RUN pkg-config --modversion gtest | grep -q "${GTEST_VERSION}"
+
+CMD ["/bin/bash"]

external-dependencies/googletest/Jenkinsfile

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+pipeline {
+    agent any
+
+    environment {
+        GTEST_VERSION = '1.15.2'
+        HARBOR_REGISTRY = 'harbor.sl.defence-elec.de/proxydockerhub'
+        IMAGE_NAME = 'googletest'
+        IMAGE_TAG = "${GTEST_VERSION}"
+    }
+
+    options {
+        timeout(time: 20, unit: 'MINUTES')
+        buildDiscarder(logRotator(numToKeepStr: '10'))
+    }
+
+    stages {
+        stage('Checkout') {
+            steps {
+                checkout scm
+            }
+        }
+
+        stage('Build GoogleTest Container') {
+            steps {
+                script {
+                    dir('external-dependencies/googletest') {
+                        sh """
+                            docker build \
+                              --build-arg GTEST_VERSION=${GTEST_VERSION} \
+                              -t ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} \
+                              .
+                        """
+                    }
+                }
+            }
+        }
+
+        stage('Verify GoogleTest') {
+            steps {
+                script {
+                    sh """
+                        docker run --rm ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG} bash -c '
+                          pkg-config --modversion gtest
+                        '
+                    """
+                }
+            }
+        }
+
+        stage('Generate SBOM') {
+            steps {
+                script {
+                    dir('external-dependencies/googletest') {
+                        sh """
+                            mkdir -p sbom
+                            
+                            # Set environment variables for SBOM generation
+                            export GIT_URL="${env.GIT_URL}"
+                            export GIT_COMMIT="${env.GIT_COMMIT}"
+                            export BUILD_NUMBER="${env.BUILD_NUMBER}"
+                            export DOCKERFILE_PATH="external-dependencies/googletest/Dockerfile"
+                            
+                            # Generate CycloneDX SBOM, SLSA provenance, and license report
+                            bash ../scripts/generate-sbom.sh googletest ${GTEST_VERSION} ./sbom
+                        """
+                    }
+                }
+            }
+        }
+
+        stage('Push to Registry') {
+            steps {
+                script {
+                    withCredentials([usernamePassword(
+                        credentialsId: 'harbor-credentials',
+                        usernameVariable: 'HARBOR_USER',
+                        passwordVariable: 'HARBOR_PASSWORD'
+                    )]) {
+                        sh """
+                            echo ${HARBOR_PASSWORD} | docker login ${HARBOR_REGISTRY} -u ${HARBOR_USER} --password-stdin
+                            docker push ${HARBOR_REGISTRY}/${IMAGE_NAME}:${IMAGE_TAG}
+                            docker logout ${HARBOR_REGISTRY}
+                        """
+                    }
+                }
+            }
+        }
+    }
+
+    post {
+        always {
+            cleanWs()
+        }
+    }
+}

external-dependencies/googletest/README.md

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+# GoogleTest
+
+GoogleTest testing framework installation pipeline.
+
+## Version
+
+- **GoogleTest:** 1.15.2 (v1.15.2 tag)
+- **Repository:** https://github.com/google/googletest
+- **License:** BSD 3-Clause
+
+## Installation
+
+```bash
+git clone --depth 1 --branch v1.15.2 https://github.com/google/googletest.git /tmp/googletest
+cd /tmp/googletest
+mkdir build && cd build
+cmake -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_INSTALL_PREFIX=/usr/local \
+      -DBUILD_SHARED_LIBS=ON \
+      ..
+cmake --build . -j$(nproc)
+cmake --install .
+```
+
+## Verification
+
+```bash
+pkg-config --modversion gtest
+```
+
+## SBOM
+
+- `sbom/googletest-1.15.2-sbom.json`
+- `sbom/googletest-1.15.2-provenance.json`
+- `sbom/googletest-1.15.2-licenses.md`