feat: declare base image and fedora ver in recipe

.github/workflows/build.yml

@@ -46,6 +46,8 @@ jobs:
       - name: Gather image data from recipe
         run: |
           echo "IMAGE_NAME=$(yq '.name' ./recipe.yml)" >> $GITHUB_ENV
+          echo "FEDORA_MAJOR_VERSION=$(yq '.fedora-version' ./recipe.yml)" >> $GITHUB_ENV
+          echo "BASE_CONTAINER_URL=$(yq '.base-container' ./recipe.yml)" >> $GITHUB_ENV
 
       - name: Generate tags
         id: generate-tags
@@ -113,7 +115,8 @@ jobs:
           tags: |
             ${{ steps.generate-tags.outputs.alias_tags }}
           build-args: |
-            FEDORA_MAJOR_VERSION=${{ matrix.major_version }}
+            FEDORA_MAJOR_VERSION=${{ env.FEDORA_MAJOR_VERSION }}
+            BASE_CONTAINER_URL=${{ env.BASE_CONTAINER_URL }}
           labels: ${{ steps.meta.outputs.labels }}
           oci: false
 

Containerfile

@@ -1,7 +1,7 @@
 ARG FEDORA_MAJOR_VERSION=37
+ARG BASE_CONTAINER_URL=ghcr.io/ublue-os/silverblue-main
 
-# change this line if you want to change the image
+FROM ${BASE_CONTAINER_URL}:${FEDORA_MAJOR_VERSION}
-FROM ghcr.io/ublue-os/silverblue-main:${FEDORA_MAJOR_VERSION}
 
 # copy over configuration files
 COPY etc /etc

recipe.yml

@@ -1,4 +1,13 @@
+# the image will be at ghcr.io/yourusername/name
 name: startingpoint
+
+# what native container image to build on top of
+# images not built by ublue might function unexpectly
+base-container: ghcr.io/ublue-os/silverblue-main
+
+# what fedora version to use, you can just change this to update
+fedora-version: 37
+
 rpms:
   - python3-pip # needed for yafti
 flatpaks: