Allow users to build against podman-sequoia in non-default locations

This mirrors the same Make veriable in Skopeo and (proposed) Podman.

Signed-off-by: Miloslav Trmač <[email protected]>

Author: mtrmac

Makefile

@@ -37,8 +37,9 @@ SOURCE_DATE_EPOCH ?= $(if $(shell date +%s),$(shell date +%s),$(error "date fail
 COMMENT := \#
 CNI_COMMIT := $(shell sed -n 's;^$(COMMENT) github.com/containernetworking/cni \([^ \n]*\).*$$;\1;p' vendor/modules.txt)
 
+SEQUOIA_SONAME_DIR =
 EXTRA_LDFLAGS ?=
-BUILDAH_LDFLAGS := $(GO_LDFLAGS) '-X main.GitCommit=$(GIT_COMMIT) -X main.buildInfo=$(SOURCE_DATE_EPOCH) -X main.cniVersion=$(CNI_COMMIT) $(EXTRA_LDFLAGS)'
+BUILDAH_LDFLAGS := $(GO_LDFLAGS) '-X main.GitCommit=$(GIT_COMMIT) -X main.buildInfo=$(SOURCE_DATE_EPOCH) -X main.cniVersion=$(CNI_COMMIT) -X go.podman.io/image/v5/signature/internal/sequoia.sequoiaLibraryDir="$(SEQUOIA_SONAME_DIR)" $(EXTRA_LDFLAGS)'
 
 # This isn't what we actually build; it's a superset, used for target
 # dependencies. Basically: all *.go and *.c files, except *_test.go,