[multicast] default the multicast feature and wire SoftNPU end-to-end

.github/buildomat/jobs/image.sh

@@ -101,7 +101,7 @@ pfexec chown "$UID" /out
 
 banner "P4 Codegen"
 # Add gcc-14 so the p4 compiler can find cpp
-PATH=/opt/gcc-14/bin:$PATH cargo xtask codegen --stages $TOFINO_STAGES
+PATH=/opt/gcc-14/bin:$PATH cargo xtask codegen --stages $TOFINO_STAGES --multicast
 
 # Preserve all the diagnostics spit out by the compiler
 mkdir -p /out/p4c-diags

.github/buildomat/packet-test-common.sh

@@ -8,16 +8,10 @@ export WS=$wd
 MODEL_STARTUP_TIMEOUT=${MODEL_STARTUP_TIMEOUT:=5}
 STARTUP_TIMEOUT=${STARTUP_TIMEOUT:=120}
 
-if [ x$MULTICAST == x ]; then
-        BUILD_FEATURES=tofino_asic
-	CODEGEN_FEATURES=
-        SWADM_FEATURES=
-    else
-        BUILD_FEATURES=tofino_asic,multicast
-	CODEGEN_FEATURES=--multicast
-        SWADM_FEATURES=--features=multicast
-fi
-
+BUILD_FEATURES=tofino_asic
+
+CODEGEN_FEATURES=--multicast
+
 function cleanup {
     set +o errexit
     set +o pipefail
@@ -105,9 +99,10 @@ DENDRITE_TEST_HOST='[::1]' \
     DENDRITE_TEST_VERBOSITY=3 \
     cargo test \
     --no-fail-fast \
-    $SWADM_FEATURES \
     --test \
     counters \
+    --test \
+    multicast \
     -- \
     --ignored