Added a Dockerfile that successfully compiles on Arch

test_dockerfiles/arch_linux/Dockerfile

@@ -0,0 +1,31 @@
+FROM archlinux:latest
+
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+RUN mkdir cacophony
+
+WORKDIR $HOME/cacophony
+
+COPY Cargo.toml Cargo.toml
+
+COPY Cargo.lock Cargo.lock
+
+COPY audio/ audio/
+
+COPY common/ common/
+
+COPY data/ data/
+
+COPY input/ input/
+
+COPY io/ io/
+
+COPY render/ render/
+
+COPY src/ src/
+
+COPY text/ text/
+
+RUN pacman -Syu --noconfirm clang make pkgconfig rust speech-dispatcher alsa-lib openssl
+
+RUN cargo build --features speech_dispatcher_0_11