Docker: Add a DockerFile for a test image for manual testing

Change-Id: Ic030ff3a78f20009c0f031afd315caf26bc1b154
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

tests/manual/docker/Dockerfile

@@ -0,0 +1,21 @@
+
+FROM ubuntu:20.04
+
+RUN apt-get update \
+ && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    git \
+    openssh-client \
+    sudo \
+    vim \
+    wget \
+    cmake \
+    qtbase5-dev \
+    libqt5core5a \
+    libqt5widgets5 \
+    libqt5quick5 \
+    libqt5quickcontrols2-5 \
+    qt5-qmake \
+    g++ \
+    gdb \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*

tests/manual/docker/build.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+docker build -t qt-5-ubuntu-20.04 .