Simplify +iso target

Signed-off-by: Dimitris Karakasilis <[email protected]>

Earthfile

@@ -435,28 +435,6 @@ uki-local-artifacts:
 ###
 
 iso:
-    FROM ubuntu
-
-    COPY +version/VERSION ./
-    ARG RELEASE=$(cat VERSION)
-    ARG TARGETARCH
-
-    # args for base-image target
-    ARG --required FAMILY
-    ARG --required FLAVOR
-    ARG --required FLAVOR_RELEASE
-    ARG --required BASE_IMAGE
-    ARG --required MODEL
-    ARG --required VARIANT
-
-    # Not needed after bumping kairos-agent. remove
-    ARG ARCH=$TARGETARCH
-    ARG RELEASE=$KAIROS_VERSION
-    COPY +extract-kairos-agent-from-framework/kairos-agent kairos-agent
-    RUN ./kairos-agent versioneer bootable-artifact-name # To see the error if one occurs
-    ARG ISO_NAME=$(./kairos-agent versioneer bootable-artifact-name)
-    RUN rm kairos-agent
-
     ARG OSBUILDER_IMAGE
     FROM $OSBUILDER_IMAGE
     WORKDIR /build
@@ -466,6 +444,8 @@ iso:
     COPY --keep-own +image-rootfs/rootfs /build/image
     COPY --keep-own +image-rootfs/IMAGE IMAGE
 
+    ARG ISO_NAME=$(source /build/image/etc/os-release; echo '$KAIROS_ARTIFACT')
+
     RUN /entrypoint.sh --name $ISO_NAME --debug build-iso --squash-no-compression --date=false dir:/build/image --output /build/
     SAVE ARTIFACT IMAGE AS LOCAL build/IMAGE
     SAVE ARTIFACT /build/$ISO_NAME.iso kairos.iso AS LOCAL build/$ISO_NAME.iso