Add Static Analysis action to run on Pull Request

Unit test source files are not currently checked.  Hopefully, these can
be added so that all source files in a pull request are verified.

Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>

.github/workflows/static_analysis.yml

@@ -0,0 +1,42 @@
+
+name: Static Analysis
+
+on: pull_request
+
+jobs:
+
+  static_analysis:
+
+    name: ${{ matrix.toolchain }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+
+      matrix:
+
+        toolchain:
+          - ubuntu-latest
+
+        include:
+          - toolchain: ubuntu-latest
+            os: ubuntu-latest
+            compiler: clang
+
+    steps:
+
+    - name: Checkout Code
+      uses: actions/checkout@v2
+
+    - name: Analyze
+      uses: JacobDomagala/StaticAnalysis@master
+      with:
+        clang_tidy_args: >-
+          --config-file=$GITHUB_WORKSPACE/.clang-tidy
+          --extra-arg=-I$GITHUB_WORKSPACE/include --extra-arg=-std=c++17
+        cppcheck_args: >-
+          --enable=all --inconclusive --inline-suppr
+          -i$GITHUB_WORKSPACE/test/main.cpp
+          -i$GITHUB_WORKSPACE/test/test_*.cpp
+          --suppress=missingInclude
+          --suppress='*:$GITHUB_WORKSPACE/test/doctest.hpp'
+        init_script: tools/static_analysis_setup.sh

tools/static_analysis_setup.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Change to the "test" subdir before "build" subdir is made.
+cd test