fix: tags not properly being set in ostree remote (#6)

* fix: tags are now properly set in remote after install
* refactor: kinoite variant is better as a default except for silverblue
* refactor: use docker to build ISO

---------

Co-authored-by: Benjamin Sherman <benjamin@holyarmy.org>

.github/workflows/isogenerator-image.yml

@@ -0,0 +1,84 @@
+---
+name: isogenerator-image
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'Dockerfile'
+  push:
+    branches:
+      - main
+    paths:
+      - 'Dockerfile'
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: isogenerator
+  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"
+
+jobs:
+  push-image:
+    name: Build and push image
+    runs-on: ubuntu-22.04
+
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    strategy:
+      fail-fast: false
+
+    steps:
+      # Checkout push-to-registry action GitHub repository
+      - name: Checkout Push to Registry action
+        uses: actions/checkout@v3
+
+      # Build metadata
+      - name: Image Metadata
+        uses: docker/metadata-action@v4
+        id: meta
+        with:
+          images: |
+            ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
+
+          labels: |
+            io.artifacthub.package.readme-url=https://raw.githubusercontent.com/${{ github.repository }}/main/README.md
+            org.opencontainers.image.description=A container image for generating Universal Blue ISO files
+            org.opencontainers.image.title=${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and Push Image
+        uses: docker/build-push-action@v4
+        with:
+          context: ./
+          file: ./Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          labels: ${{ steps.meta.outputs.labels }}
+          tags: ${{ steps.meta.outputs.tags }}
+
+  check:
+    name: Check build successful
+    if: ${{ !cancelled() }}
+    runs-on: ubuntu-latest
+    needs: [push-image]
+    steps:
+      - name: Exit on failure
+        if: ${{ needs.push-image.result == 'failure' || needs.push-image.result == 'skipped' }}
+        shell: bash
+        run: exit 1
+      - name: Exit
+        shell: bash
+        run: exit 0