Add automated tests to verify curl's TLS signature

Add automated testing infrastructure with tests verifying that
`curl-impersonate` has the same TLS signature as that of the
impersonated browser.

Each wrapper script (e.g. curl_chrome98) is launched to wikipedia.org
while a packet capture is running in the background. The Client Hello
is extracted from the capture, parsed and then compared to the known
browser signature.

The known signatures are stored in a YAML database.

tests/Dockerfile

@@ -0,0 +1,21 @@
+FROM python:3.10.1-slim-buster
+
+WORKDIR /tests
+
+RUN apt-get update && \
+    apt-get install -y tcpdump libbrotli1 libnss3
+
+COPY requirements.txt requirements.txt
+
+RUN pip install --upgrade pip && \
+    pip install -r requirements.txt
+
+RUN mkdir /tests/firefox /tests/chrome
+
+# Copy the built binaries from both containers
+COPY --from=curl-impersonate-ff /build/out/* /tests/firefox/
+COPY --from=curl-impersonate-chrome /build/out/* /tests/chrome/
+
+COPY . .
+
+ENTRYPOINT ["pytest"]