Create munge_data.yml

Added GitHub action to munge CSVs into a single dataset for Vega-lite

.github/workflows/munge_data.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: munge_csv
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main branch
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  # Also trigger on page_build, as well as release created events
+  page_build:
+  release:
+    types: # This configuration does not affect the page_build event above
+      - created
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - name: checkout repo content
+        uses: actions/checkout@v2 # checkout the repository content to github runner.
+      - name: setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8 #install the python needed
+      - name: execute python script # run the run.py to get the latest data
+        run: |
+          python munge.py