add docker file for CI

https://github.com/devkitPro/pacman/issues/31

Dockerfile

@@ -0,0 +1,14 @@
+FROM devkitpro/devkita64:latest
+
+WORKDIR /app/
+
+COPY ./requirements.txt /opt/requirements.txt
+
+RUN apt-get install -y --no-install-recommends python3-venv && \
+python3 -m venv /opt/venv && \
+. /opt//venv/bin/activate && \
+pip install -r /opt/requirements.txt
+
+RUN dkp-pacman -S --needed --noconfirm \
+switch-glm switch-libjpeg-turbo \
+devkitarm-rules devkitA64 hactool

requirements.txt

@@ -0,0 +1,2 @@
+lz4==4.3.3
+pycryptodome==3.20.0