fix: set base image to scratch

The org.opencontainers.image.base.name should not reference images used
to generate the contents of the image. The base image we have in the
FROM statement is scratch.

Signed-off-by: Francesco Canovai <[email protected]>

Author: fcanovai

.github/workflows/bake_targets.yml

@@ -158,7 +158,7 @@ jobs:
           EXT_IMAGE: ${{ matrix.image }}
         run: |
           # Get the PG base image
-          PG_IMAGE=$(skopeo inspect "docker://$EXT_IMAGE" -f '{{ json .Labels }}' | jq -r '."org.opencontainers.image.base.name"')
+          PG_IMAGE=$(skopeo inspect "docker://$EXT_IMAGE" -f '{{ json .Labels }}' | jq -r '."io.cloudnativepg.image.base.name"')
 
           # Merge metadata.json with runtime values to generate Chainsaw values.yaml
           jq --arg ext_image "$EXT_IMAGE" \

docker-bake.hcl

@@ -75,7 +75,8 @@ target "default" {
     "index,manifest:org.opencontainers.image.documentation=${url}",
     "index,manifest:org.opencontainers.image.authors=${authors}",
     "index,manifest:org.opencontainers.image.licenses=Apache-2.0",
-    "index,manifest:org.opencontainers.image.base.name=${getBaseImage(distro, pgVersion)}",
+    "index,manifest:org.opencontainers.image.base.name=scratch",
+    "index,manifest:io.cloudnativepg.image.base.name=${getBaseImage(distro, pgVersion)}",
   ]
   labels = {
     "org.opencontainers.image.created" = "${now}",
@@ -88,8 +89,9 @@ target "default" {
     "org.opencontainers.image.description" = "A ${metadata.name} ${pgVersion}-${getExtensionVersion(distro, pgVersion)} container image",
     "org.opencontainers.image.documentation" = "${url}",
     "org.opencontainers.image.authors" = "${authors}",
-    "org.opencontainers.image.licenses" = "Apache-2.0"
-    "org.opencontainers.image.base.name" = "${getBaseImage(distro, pgVersion)}"
+    "org.opencontainers.image.licenses" = "Apache-2.0",
+    "org.opencontainers.image.base.name" = "scratch",
+    "io.cloudnativepg.image.base.name" = "${getBaseImage(distro, pgVersion)}",
   }
 }