Github CI workflow using docker images (#627)

Currently only tests build and unit tests. Will add lightweight regression tests with follow-up pull-requests.

.dockerignore

@@ -0,0 +1,8 @@
+.git
+examples
+reg_tests
+build*
+wind-utils
+python
+**/tests
+.*

.github/workflows/ci.yml

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+name: Nalu-Wind-CI
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'cmake/**'
+      - 'include/**'
+      - 'src/**'
+      - 'unit_tests/**'
+      - 'CMakeLists.txt'
+      - 'CTestConfig.cmake'
+      - 'Dockerfile'
+      - 'nalu.C'
+      - 'unit_tests.C'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - 'cmake/**'
+      - 'include/**'
+      - 'src/**'
+      - 'unit_tests/**'
+      - 'CMakeLists.txt'
+      - 'CTestConfig.cmake'
+      - 'Dockerfile'
+      - 'nalu.C'
+      - 'unit_tests.C'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build and test
+        run: docker build -t nalu-wind .

Dockerfile

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+ARG BASE_IMG=exawind/exawind-dev:latest
+FROM ${BASE_IMG} AS base
+
+WORKDIR /workspace
+COPY . /workspace
+
+ARG NUM_PROCS=16
+RUN (\
+    cmake \
+      -Bbuild \
+      -DCMAKE_BUILD_TYPE=RELEASE \
+      -DCMAKE_PREFIX_PATH=/opt/exawind \
+      -DCMAKE_INSTALL_PREFIX=/opt/exawind \
+      -DBUILD_SHARED_LIBS=ON \
+      -DENABLE_HYPRE=ON -DENABLE_TIOGA=ON -DENABLE_OPENFAST=ON . \
+    && cd build \
+    && make -j${NUM_PROCS} \
+    && make install \
+    && export LD_LIBRARY_PATH=/opt/exawind:/usr/local/lib:${LD_LIBRARY_PATH} \
+    && ./unittestX --gtest_filter=-Actuator*.* \
+    )
+
+RUN (\
+    echo "/opt/exawind/lib" > /etc/ld.so.conf.d/exawind.conf \
+    && ldconfig \
+    )
+
+ENV PATH /opt/exawind/bin:${PATH}
+WORKDIR /run