add workflows

.github/workflows/build_and_test_docker.yml

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+on: [push]
+
+name: build and test docker image
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build the Docker image
+        run: docker build . --file Dockerfile --tag pgge
+      - name: Run a test on the DRB1-3123 dataset
+        run: docker run -it -v ${PWD}/data/:/data pgge "pgge -g "/data/HLA/DRB1-3123/*.consensus*.gfa" -f /data/HLA/DRB1-3123/DRB1-3123.fa -r /scripts/beehave.R -t 2 -o /data/HLA/DRB1-3123/pgge_docker -l 1000 -s 1000 -p 100"

.github/workflows/publish_docker.yml

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+name: Publish container to github container registry
+
+# Documentation on the primary Action used here: https://github.com/marketplace/actions/publish-docker
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish_release:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@master
+    - name: Publish to Registry
+      uses: elgohr/Publish-Docker-Github-Action@master
+      with:
+        name: pangenome/pgge
+        username: subwaystation
+        password: ${{ secrets.PGGB_DOCKER_TOKEN }}
+        registry: ghcr.io
+        tags: "latest"
+        snapshot: true
+