[CircleCI] Fix short-tests-0

short-tests-0 were silently failing. I think because of the && make clean construction. Switch to ; instead.

Also fix all the test failures that were exposed.

`make all` is failing on CircleCI because it is missing Docker. Move that test
to GitHub actions, and switch the pedantic CircleCI test to `make allmost`.

lib/common/compiler.h

@@ -258,7 +258,10 @@
 # elif ZSTD_HAS_CPP_ATTRIBUTE(fallthrough)
 #  define ZSTD_FALLTHROUGH [[fallthrough]]
 # elif __has_attribute(__fallthrough__)
-#  define ZSTD_FALLTHROUGH __attribute__((__fallthrough__))
+/* Leading semicolon is to satisfy gcc-11 with -pedantic. Without the semicolon
+ * gcc complains about: a label can only be part of a statement and a declaration is not a statement.
+ */
+#  define ZSTD_FALLTHROUGH ; __attribute__((__fallthrough__))
 # else
 #  define ZSTD_FALLTHROUGH
 # endif