Feature/containerize (#6)

* containerize w/ github action to build and push to ghcr

* fix gh action yml syntax

* enable manual trigger

* fix syntax

* dont use github action, do it ourselves

* push manually

* correct multi line

.github/workflows/astria-build-and-publish-image.yml

@@ -20,7 +20,8 @@ jobs:
       # TODO - build for amd64 and arm64?
       # FIXME - version needs to be autoincrement, probably from git tags?
       - name: Build latest Docker image
-        run: docker build \
+        run: |
+          docker build \
             --build-arg COMMIT=${GITHUB_SHA} \
             --build-arg VERSION=0.1 \
             --build-arg BUILDNUM=${GITHUB_RUN_NUMBER} \