refactor: first run-up of docker for runtime (#135)

Provide a docker container for homestar (first run), plus other
refactoring around builds.

.dockerignore

@@ -2,8 +2,9 @@
 
 !**/Cargo.toml
 !**/Cargo.lock
-
-# only include runtime binary
-homestar-core
-homestar-guest-wasm
-homestar-wasm
+!**/src
+!**/config
+!**/migrations
+!.env
+!diesel.toml
+!**/wits

.github/workflows/docker.yml

@@ -1,20 +1,12 @@
 name: 🐳 Docker
 
 on:
-  push:
-    branches: [ main ]
-
-  pull_request:
-    branches: [ '**' ]
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  schedule:
+    - cron: '0 0 * * *'
 
 jobs:
   build-docker:
     runs-on: ubuntu-latest
-    if: ${{ github.event_name == 'pull_request' }}
 
     env:
       DOCKER_BUILDKIT: 1
@@ -33,21 +25,14 @@ jobs:
         with:
           buildkitd-flags: "--debug"
 
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
       - name: Docker Build
         uses: docker/build-push-action@v4
         with:
-          cache-from: type=registry,ref=ghcr.io/${{ github.repository_owner }}/homestar:latest
-          cache-to: type=registry,ref=ghcr.io/${{ github.repository_owner }}/homestar:latest,mode=max
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           file: docker/Dockerfile
           context: .
-          platforms: linux/amd64, linux/arm64
+          platforms: linux/amd64
           push: false
           tags: |
             ${{ github.repository_owner }}/homestar:latest