t5509: specify bare repository path explicitly

When `ls-remote` is told to switch the current working directory to the
bare repository `pushee` via `-C pushee`, as part of the
`safe.bareRepository` preparation let's append `--git-dir=.` to spell
out that this is a bare repository that does not need to be discovered
implictly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

t/t5509-fetch-push-namespaces.sh

@@ -88,7 +88,7 @@ test_expect_success 'mirroring a repository using a ref namespace' '
 
 test_expect_success 'hide namespaced refs with transfer.hideRefs' '
 	GIT_NAMESPACE=namespace \
-		git -C pushee -c transfer.hideRefs=refs/tags \
+		git -C pushee --git-dir=. -c transfer.hideRefs=refs/tags \
 		ls-remote "ext::git %s ." >actual &&
 	printf "$commit1\trefs/heads/main\n" >expected &&
 	test_cmp expected actual
@@ -97,7 +97,7 @@ test_expect_success 'hide namespaced refs with transfer.hideRefs' '
 test_expect_success 'check that transfer.hideRefs does not match unstripped refs' '
 	git -C pushee pack-refs --all &&
 	GIT_NAMESPACE=namespace \
-		git -C pushee -c transfer.hideRefs=refs/namespaces/namespace/refs/tags \
+		git -C pushee --git-dir=. -c transfer.hideRefs=refs/namespaces/namespace/refs/tags \
 		ls-remote "ext::git %s ." >actual &&
 	printf "$commit1\trefs/heads/main\n" >expected &&
 	printf "$commit0\trefs/tags/0\n" >>expected &&
@@ -107,7 +107,7 @@ test_expect_success 'check that transfer.hideRefs does not match unstripped refs
 
 test_expect_success 'hide full refs with transfer.hideRefs' '
 	GIT_NAMESPACE=namespace \
-		git -C pushee -c transfer.hideRefs="^refs/namespaces/namespace/refs/tags" \
+		git -C pushee --git-dir=. -c transfer.hideRefs="^refs/namespaces/namespace/refs/tags" \
 		ls-remote "ext::git %s ." >actual &&
 	printf "$commit1\trefs/heads/main\n" >expected &&
 	test_cmp expected actual