Take mkosi.conf's ImageId instead of macro

No special macro is needed to set the filename, take ImageID (if set) or
default to "image".
Also no sha256 generateion needs to be done, mkosi creates it for all
files in $OUTPUTDIR in "$IMAGENAME.SHA256SUMS"

build-recipe-mkosi

@@ -100,8 +100,11 @@ recipe_build_mkosi() {
         cp -r "/.build/" "$TOPDIR/scripts"
         chmod +x "$TOPDIR/scripts/.build/generate_sbom"
         mkdir -p $BUILD_ROOT/$TOPDIR/SOURCES/mkosi.conf.d/99-sbom/
-        IMAGENAME=$(queryconfig --dist "$BUILD_DIST" --configdir "$CONFIG_DIR" --archpath "$BUILD_ARCH" eval '%{?mkosi_sbom_name}' || "image")
+        IMAGENAME=$(grep ImageId= "${RECIPEFILE}" | sed "s/\s*ImageId\s*=\s*\(.*\)\s*/\1/")
         IMAGENAME=${IMAGENAME:-image}
+        if [ -n "$RELEASE" ]; then
+            IMAGENAME="${IMAGENAME}_${RELEASE}"
+        fi
         echo "IMAGENAME= $IMAGENAME"
         echo "generating script for sbom $format"
 cat << EOF >> $BUILD_ROOT/$TOPDIR/SOURCES/mkosi.conf.d/99-sbom/mkosi.finalize
@@ -116,10 +119,7 @@ $TOPDIR/scripts/.build/generate_sbom \
   --configdir "$TOPDIR/scripts/$CONFIG_DIR" \
   --archpath "$BUILD_ARCH" \
   --format "$format" \
-  --dir "$IMAGENAME"  > "\$OUTPUTDIR/\${imgname}${buildnum}.${format/cyclonedx/cdx}.json"
-pushd \$OUTPUTDIR >/dev/null
-/usr/bin/sha256sum "\${imgname}${buildnum}.${format/cyclonedx/cdx}.json" > "\${imgname}${buildnum}.${format/cyclonedx/cdx}.json".sha256
-popd >/dev/null
+  --dir "$IMAGENAME"  > "\$OUTPUTDIR/${IMAGENAME}.${format/cyclonedx/cdx}.json"
 EOF
         chmod +x $BUILD_ROOT/$TOPDIR/SOURCES/mkosi.conf.d/99-sbom/mkosi.finalize
     done