entrypoint.sh: Small improvements

We can't quote argument 1, as it is expected to contain
multiple whitespace-seprated parameters and we need to expand any
globs in it.

This adds the use of "tee", so that the output goes to both the
file specified in $2 and also to stdout (so the results are directly
visible in the CI/CD display).

Signed-off-by: David A. Wheeler <dwheeler@dwheeler.com>

entrypoint.sh

@@ -1,5 +1,5 @@
 #!/bin/sh -l
-# $1 arguments. BEWARE: Some filenames may need to be escaped.
+# $1 whitespace-separated arguments. Some filenames may need to be escaped.
 # $2 output filename
 
-flawfinder "$@" > "$2"
+flawfinder $1 | tee "$2"