initial Github Actions workflows

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/build.yml

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+name: Build
+
+on: 
+  push:
+    paths:
+      - 'src/**'
+      - 'include/**'
+      - 'Makefile'
+      - '*.mk'
+      - '.github/workflows/build.yml'
+
+jobs:
+
+  build:
+    name: Build library
+
+    runs-on: ubuntu-latest
+    env:
+      CC: gcc
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Build static library
+      run: make static
+
+    - name: Build shared library
+      run: make shared   
+
+
+

.github/workflows/check.yml

@@ -0,0 +1,28 @@
+name: Static Analysis
+
+on:
+  push:
+    paths:
+      - 'src/**'
+      - 'include/**'
+      - 'Makefile'
+      - '*.mk'
+      - '.github/workflows/check.yml'
+
+jobs:
+
+  cppcheck:
+    name: Check source code
+
+    runs-on: ubuntu-latest
+    env:
+      CC: gcc
+    steps:
+
+    - uses: actions/checkout@v4
+
+    - name: install dependencies
+      run: sudo apt-get install -y cppcheck
+
+    - name: Run cppcheck
+      run: make check

.github/workflows/dox.yml

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+name: API documentation
+
+on:
+  release:
+    types: [published]
+
+  push:
+    paths:
+      - 'src/**'
+      - 'include/**'
+      - 'css/**'
+      - 'Doxyfile'
+      - '*.md'
+      - '.github/workflows/dox.yml'
+
+jobs:   
+
+  apidocs:
+    name: Generate API documentation
+
+    runs-on: ubuntu-latest
+    env:
+      CC: gcc
+    steps:
+
+    - name: install doxygen
+      run: sudo apt-get install doxygen
+
+    - uses: actions/checkout@v4
+
+    - name: Generate docs
+      run: make dox
+
+  site-update:
+    name: Update github pages
+    needs: apidocs
+    if: github.repository_owner == 'Smithsonian' && (github.event_name == 'release' || contains(github.event.head_commit.message, 'site update'))
+
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout source
+      uses: actions/checkout@v4
+
+    - name: Generate headless README
+      run: make README-orig.md
+
+    - uses: mattnotmitt/[email protected]
+      with:
+        additional-packages: font-roboto
+
+    - name: Checkout gh-pages
+      uses: actions/checkout@v4
+      with:
+        ref: 'gh-pages'
+        path: site
+
+    - name: Assert site/doc/
+      run: mkdir -p site/doc 
+
+    - name: Copy README
+      run: |
+        echo '<img src="/xchange/resources/CfA-logo.png" alt="CfA logo" width="400" height="67" align="right">' > site/doc/README.md
+        echo '<br clear="all">' >> site/doc/README.md
+        cat README-orig.md >> site/doc/README.md
+        
+    - name: Copy CHANGELOG
+      run: cp CHANGELOG.md site/doc/
+
+    - name: Copy API documentation
+      run: cp -a apidoc site/
+
+    - name: Push to pages
+      run: |
+        cd site
+        git config --global user.email "$GITHUB_JOB+github-actions[bot]@users.noreply.github.com"
+        git config --global user.name "github-actions"
+        git add -A
+        git commit -m "[automated site update]" && git push || true
+        
+        
+  changelog-update:
+    name: Update CHANGELOG on github pages
+    if: github.repository_owner == 'Smithsonian' && contains(github.event.head_commit.message, 'changelog update')
+
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout source
+      uses: actions/checkout@v4
+
+    - name: Checkout gh-pages
+      uses: actions/checkout@v4
+      with:
+        ref: 'gh-pages'
+        path: site
+
+    - name: Assert site/doc/
+      run: mkdir -p site/doc 
+
+    - name: Copy CHANGELOG
+      run: cp CHANGELOG.md site/doc/
+
+    - name: Push to pages
+      run: |
+        cd site
+        git config --global user.email "$GITHUB_JOB+github-actions[bot]@users.noreply.github.com"
+        git config --global user.name "github-actions"
+        git add -A
+        git commit -m "[automated site update]" && git push || true
+    
+
+