[analyzer] SATest: Add initial docker infrastructure

Summary:
Static analysis is very sensitive to environment.
OS and libraries installed can affect the results.  This fact makes
it extremely hard to have a regression testing system that will
produce stable results.

For this very reason, this commit introduces a new dockerized testing
environment, so that every analyzer developer can check their changes
against previous analysis results.

Differential Revision: https://reviews.llvm.org/D81571

clang/utils/analyzer/Dockerfile

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+FROM ubuntu:bionic
+
+RUN apt-get update && apt-get install -y \
+    apt-transport-https \
+    ca-certificates \
+    gnupg \
+    software-properties-common \
+    wget
+
+# newer CMake is required by LLVM
+RUN wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | tee /etc/apt/trusted.gpg.d/kitware.gpg >/dev/null
+RUN apt-add-repository -y 'deb https://apt.kitware.com/ubuntu/ bionic main'
+
+# test system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    gettext \
+    python3 \
+    python3-pip \
+    cmake \
+    ninja-build
+
+# box2d dependencies
+RUN apt-get install -y \
+    libx11-dev \
+    libxrandr-dev \
+    libxinerama-dev \
+    libxcursor-dev \
+    libxi-dev
+
+# symengine dependencies
+RUN apt-get install -y \
+    libgmp10 \
+    libgmp-dev
+
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 1
+
+VOLUME /analyzer
+VOLUME /projects
+VOLUME /llvm-project
+VOLUME /build
+VOLUME /scripts
+
+ENV PATH="/analyzer/bin:${PATH}"
+
+ADD entrypoint.py /entrypoint.py
+
+# Uncomment in case of requirements
+# ADD requirements.txt /requirements.txt
+# RUN pip3 install -r /requirements.txt
+
+ENTRYPOINT ["python", "/entrypoint.py"]

clang/utils/analyzer/entrypoint.py

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+import argparse
+import os
+
+from typing import List, Tuple
+
+from subprocess import check_call
+
+
+def main():
+    settings, rest = parse_arguments()
+    if settings.build_llvm or settings.build_llvm_only:
+        build_llvm()
+    if settings.build_llvm_only:
+        return
+    test(rest)
+
+
+def parse_arguments() -> Tuple[argparse.Namespace, List[str]]:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--build-llvm', action='store_true')
+    parser.add_argument('--build-llvm-only', action='store_true')
+    return parser.parse_known_args()
+
+
+def build_llvm() -> None:
+    os.chdir('/build')
+    cmake()
+    ninja()
+
+
+CMAKE_COMMAND = "cmake -G Ninja -DCMAKE_BUILD_TYPE=Release " \
+    "-DCMAKE_INSTALL_PREFIX=/analyzer -DLLVM_TARGETS_TO_BUILD=X86 " \
+    "-DLLVM_ENABLE_PROJECTS=clang -DLLVM_BUILD_RUNTIME=OFF " \
+    "-DLLVM_ENABLE_TERMINFO=OFF -DCLANG_ENABLE_ARCMT=OFF " \
+    "-DCLANG_ENABLE_STATIC_ANALYZER=ON"
+
+
+def cmake():
+    check_call(CMAKE_COMMAND + ' /llvm-project/llvm', shell=True)
+
+
+def ninja():
+    check_call("ninja install", shell=True)
+
+
+def test(args: List[str]):
+    os.chdir("/projects")
+    check_call("/scripts/SATest.py " + " ".join(args), shell=True)
+
+
+if __name__ == '__main__':
+    main()