Add CI Dockerfile

ci/trusty/Dockerfile

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+# KeePassXC Linux Release Build Dockerfile
+# Copyright (C) 2017 KeePassXC team <https://keepassxc.org/>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 or (at your option)
+# version 3 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# TIP: check this Dockerfile using this online tool: https://www.fromlatest.io
+
+FROM ubuntu:trusty
+
+RUN set -x \
+    && apt-get -y update \
+    && apt-get -y --no-install-recommends install \
+      git build-essential clang-3.6 libclang-common-3.6-dev clang-format-3.6 cmake3 make \
+      curl ca-certificates gnupg2 \
+      libgcrypt20-dev zlib1g-dev libyubikey-dev libykpers-1-dev \
+      qttools5-dev \
+      qttools5-dev-tools \
+      qtbase5-dev \
+      libqt5x11extras5-dev \
+      libxi-dev \
+      libxtst-dev \
+      xvfb \
+    && apt-get autoremove --purge \
+    && rm -rf /var/lib/apt/lists/*
+
+VOLUME ["/keepassxc"]
+WORKDIR /keepassxc