reverted travis config

.travis.yml

@@ -14,9 +14,12 @@ env:
   global:
     - DOCKER_BUILDKIT=0
   matrix:
-    - DISTRIB_ID=ubuntu VARIANT=minsize   MARCH=arm32v7  CHECK_TARGET=check
-    - DISTRIB_ID=ubuntu VARIANT=debug     MARCH=arm32v7  CHECK_TARGET=check
-    - DISTRIB_ID=ubuntu VARIANT=release   MARCH=arm32v7  CHECK_TARGET=check
+    - DISTRIB_ID=ubuntu VARIANT=debug        MARCH=x86_64   CHECK_TARGET=memcheck
+    - DISTRIB_ID=ubuntu VARIANT=coverage     MARCH=x86_64   CHECK_TARGET=check
+    - DISTRIB_ID=ubuntu VARIANT=release      MARCH=x86_64   CHECK_TARGET=memcheck
+    - DISTRIB_ID=ubuntu VARIANT=debug        MARCH=arm32v7  CHECK_TARGET=check
+    - DISTRIB_ID=ubuntu VARIANT=minsize      MARCH=arm32v7  CHECK_TARGET=check
+    - DISTRIB_ID=alpine VARIANT=debug        MARCH=x86_64   CHECK_TARGET=check
 before_script:
 - make -j4 DISTRIB_ID=$DISTRIB_ID VARIANT=$VARIANT MARCH=$MARCH
 script: