[setup](build): most from @RalphHightower, others

Signed-off-by: Ralph Hightower <[email protected]>

.github/workflows/docker-update.yml

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+# This workflow updates the docker container which has context and
+# pandoc installed, and on which the resume documents are built. The
+# workflow runs whenever the dockerfile is changed, and updates the
+# container image in the Github Packages registry.
+
+name: Publish Docker Image
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push events but only for the master branch
+  push:
+    branches: [ master ]
+    paths-ignore:
+      - 'markdown/**'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and Push to GitHub Packages
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          file: .docker/resume.dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: build-resume
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ master ]
+    paths:
+      - 'markdown/**'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build-resume:
+    runs-on: ubuntu-latest
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: Test directory contents
+        run: 'ls -al'
+
+      - name: Build resume
+        uses: ./actions
+
+      - name: Upload a Build Artifact
+        uses: actions/[email protected]
+        with:
+          # Artifact name
+          name: Resume PDF # optional, default is artifact
+          # A file, directory or wildcard pattern that describes what to upload
+          path: output/*.pdf
+