fixup! fixup! riotdocker-base: Split out build logic

Author: maribu

riotdocker-base/build.sh

@@ -12,7 +12,9 @@ NORMAL="\e[0m"
 step() {
     COUNTER_SUBSTEP=0
     COUNTER_STEP=$(("$COUNTER_STEP" + 1))
-    echo "::group::"
+    if [ -n "${GITHUB_RUN_ID}" ]; then
+        echo "::group::"
+    fi
     printf "${BLUE}${BOLD}==>${NORMAL}${BOLD} Step %d:${NORMAL} %s\n" "$COUNTER_STEP" "$1"
 }
 
@@ -24,7 +26,9 @@ endstep() {
 
 substep() {
     COUNTER_SUBSTEP=$(("$COUNTER_SUBSTEP" + 1))
-    echo "::group::"
+    if [ -n "${GITHUB_RUN_ID}" ]; then
+        echo "::group::"
+    fi
     printf "${BLUE}${BOLD}    -->${NORMAL}${BOLD} Step %d.%d:${NORMAL} %s\n" \
         "$COUNTER_STEP" "$COUNTER_SUBSTEP" "$1"
 }