Update web-platform-tests to revision 3bfdeb8976fc51748935c8d1f1014dfba8e08dfb

tests/wpt/web-platform-tests/tools/docker/github/Dockerfile

@@ -0,0 +1,29 @@
+FROM ubuntu:18.04
+
+# No interactive frontend during docker build
+ENV DEBIAN_FRONTEND=noninteractive \
+    DEBCONF_NONINTERACTIVE_SEEN=true
+
+RUN apt-get -qqy update \
+  && apt-get -qqy install \
+    bzip2 \
+    git \
+    locales \
+    python \
+    python-pip \
+    tzdata \
+    zstd
+
+RUN pip install --upgrade pip
+RUN pip install virtualenv
+RUN pip install requests
+
+ENV TZ "UTC"
+RUN echo "${TZ}" > /etc/timezone \
+  && dpkg-reconfigure --frontend noninteractive tzdata
+
+# Set the locale
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8