ci: implement using CirrusCI

.cirrus.yml

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+task:
+  name: build-ubuntu1604
+  container:
+    cpu: 4
+    memory: 8
+    dockerfile: .cirrus/Dockerfile.ubuntu16.04
+
+  build_script: mkdir build && cd build && cmake .. -DARCH=all -DTRELLIS_ROOT=/usr/local/src/prjtrellis && make -j $(nproc)

.cirrus/Dockerfile.ubuntu16.04

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+FROM ubuntu:xenial-20181113
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN set -e -x ;\
+    apt-get -y update ;\
+    apt-get -y upgrade ;\
+    apt-get -y install \
+        build-essential cmake clang python3-dev libboost-all-dev qt5-default git
+
+RUN set -e -x ;\
+    apt-get -y install \
+        libftdi-dev pkg-config
+
+RUN set -e -x ;\
+    mkdir -p /usr/local/src ;\
+    cd /usr/local/src ;\
+    git clone --recursive https://github.com/cliffordwolf/icestorm.git ;\
+    cd icestorm ;\
+    git reset --hard 9671b760f84ca4006f0ef101a3e3b201df4eabb5 ;\
+    make -j $(nproc) ;\
+    make install
+
+RUN set -e -x ;\
+    mkdir -p /usr/local/src ;\
+    cd /usr/local/src ;\
+    git clone --recursive https://github.com/SymbiFlow/prjtrellis.git ;\
+    cd prjtrellis ;\
+    git reset --hard de035a6e5e5818804a66b9408f0ad381b10957db ;\
+    cd libtrellis ;\
+    cmake -DCMAKE_INSTALL_PREFIX=/usr . ;\
+    make -j $(nproc) ;\
+    make install