tests: add project dir to PATH

abuild and abump call a few helpers that are expected to be available in
PATH. As abuild is not installed yet, they are not in the default PATH
locations.

Add the project root dir to $PATH to make sure these helpers can be found.

tests/abuild.bats

@@ -10,6 +10,7 @@ setup() {
 	export WORKDIR="$tmpdir"/work
 	export GIT_CONFIG_GLOBAL="$tmpdir"/gitconfig
 	export APORTSDIR="$PWD"/testrepo
+	export PATH="$PWD/../:$PATH"
 
 	mkdir -p "$tmpdir" "$WORKDIR"
 	printf "[color]\n\tui = always\n" > "$GIT_CONFIG_GLOBAL"

tests/abump.bats

@@ -13,6 +13,7 @@ setup() {
 	export APORTSDIR="$tmpdir"
 	export ABUILD_OPTS=""
 	export ABUILD_APK_INDEX_OPTS="--keys-dir=$ABUILD_USERDIR"
+	export PATH="$PWD/../:$PATH"
 
 	$ABUILD_KEYGEN --append -n