Add Dockerfile to build packages for the Tails Linux distribution.

build-tailsOS.Dockerfile

@@ -0,0 +1,25 @@
+FROM debian:latest as base
+ARG DEBIAN_FRONTEND=noninteractive
+WORKDIR /app
+COPY . source
+COPY .git source/.git
+
+RUN apt update -y 
+RUN apt install -y  \
+    build-essential autogen libtool shtool     \
+    clang llvm lld libstdc++6 libc++-dev libc++1 libc++abi1         \
+    git-buildpackage    \
+    git                 \
+    coreutils binutils          \
+    bash
+WORKDIR source
+FROM base
+ARG DEBIAN_FRONTEND=noninteractive
+SHELL ["/bin/bash", "-c"]
+RUN chmod -x debian/clean
+RUN git submodule update
+RUN cat debian/patches/series | xargs -I{} patch -f --strip=1 -i "debian/patches/{}" || true
+RUN patch -f --strip=1 -i debian/patches/bc-ur-build-tails.diff || true
+
+# FIXME(nochiel) It would be nice if running this line compiled the packaged the files we care about.
+# RUN gbp buildpackage --git-upstream-tree=master --git-debian-branch=debian/latest --git-ignore-new  --git-force-create --git-submodules