Update AltSign to be a submodule.

Author: NovaDev404

Makefile

@@ -7,6 +7,7 @@ APP := $(TMP)/Build/Products/Release-$(PLATFORM)
 CERT_JSON_URL := https://backloop.dev/pack.json
 WORKSPACE := NexStore.xcworkspace
 SOURCE_PACKAGES := $(TMP)/SourcePackages
+ALT_SIGN_PATH := AltSign
 XCODEBUILD_OVERRIDES :=
 
 ifdef BUILD_NUMBER
@@ -45,7 +46,7 @@ prepare_packages: deps
 	    -clonedSourcePackagesDirPath "$(SOURCE_PACKAGES)" \
 	    -skipPackagePluginValidation
 
-	ALT_SIGN_CHECKOUT="$(SOURCE_PACKAGES)/checkouts/AltSign"; \
+	ALT_SIGN_CHECKOUT="$(ALT_SIGN_PATH)"; \
 	if [ -f "$$ALT_SIGN_CHECKOUT/.gitmodules" ]; then \
 		git -C "$$ALT_SIGN_CHECKOUT" submodule sync --recursive; \
 		git -C "$$ALT_SIGN_CHECKOUT" submodule update --init --recursive; \
@@ -58,7 +59,7 @@ prepare_packages: deps
 			ln -sf ../libcnary/include/$${header##*/} "$$ALT_SIGN_LIBPLIST_SRC_DIR/$${header##*/}"; \
 		done; \
 	fi; \
-	ALT_SIGN_OPENSSL_XCFRAMEWORK="$$(find "$(SOURCE_PACKAGES)" \( -path "*/Dependencies/OpenSSL.xcframework" -o -path "*/OpenSSL.xcframework" \) -type d | head -n 1)"; \
+	ALT_SIGN_OPENSSL_XCFRAMEWORK="$$(find "$(ALT_SIGN_PATH)" "$(SOURCE_PACKAGES)" \( -path "*/Dependencies/OpenSSL.xcframework" -o -path "*/OpenSSL.xcframework" \) -type d 2>/dev/null | head -n 1)"; \
 	if [ -z "$$ALT_SIGN_OPENSSL_XCFRAMEWORK" ]; then \
 		echo "Expected AltSign OpenSSL.xcframework after package resolution." >&2; \
 		exit 1; \
@@ -77,7 +78,7 @@ prepare_packages: deps
 $(SCHEMES): prepare_packages
 	# Zsign expects <openssl/...> headers; reuse AltSign's vendored XCFramework to avoid a second OpenSSL copy.
 	set -e; \
-	ALT_SIGN_OPENSSL_XCFRAMEWORK="$$(find "$(SOURCE_PACKAGES)" \( -path "*/Dependencies/OpenSSL.xcframework" -o -path "*/OpenSSL.xcframework" \) -type d | head -n 1)"; \
+	ALT_SIGN_OPENSSL_XCFRAMEWORK="$$(find "$(ALT_SIGN_PATH)" "$(SOURCE_PACKAGES)" \( -path "*/Dependencies/OpenSSL.xcframework" -o -path "*/OpenSSL.xcframework" \) -type d 2>/dev/null | head -n 1)"; \
 	if [ -z "$$ALT_SIGN_OPENSSL_XCFRAMEWORK" ]; then \
 		echo "Expected AltSign OpenSSL.xcframework after package resolution." >&2; \
 		exit 1; \

NexStore.xcodeproj/project.pbxproj

@@ -192,7 +192,7 @@
 				33693A062DC8BF5B00730215 /* XCLocalSwiftPackageReference "AltSourceKit" */,
 				339776052DC9D05C00642FFB /* XCRemoteSwiftPackageReference "LicensePlist" */,
 				3349E7652DEFB46F00E317ED /* XCLocalSwiftPackageReference "IDeviceKitten" */,
-				33F1A0A22E17B001006C1001 /* XCRemoteSwiftPackageReference "AltSign" */,
+				33F1A0A22E17B001006C1001 /* XCLocalSwiftPackageReference "AltSign" */,
 			);
 			preferredProjectObjectVersion = 77;
 			productRefGroup = 3379C1BA2DA869A1004372DA /* Products */;
@@ -529,6 +529,10 @@
 			isa = XCLocalSwiftPackageReference;
 			relativePath = AltSourceKit;
 		};
+		33F1A0A22E17B001006C1001 /* XCLocalSwiftPackageReference "AltSign" */ = {
+			isa = XCLocalSwiftPackageReference;
+			relativePath = AltSign;
+		};
 		3371F5152DA91FDC00281AC6 /* XCLocalSwiftPackageReference "Zsign" */ = {
 			isa = XCLocalSwiftPackageReference;
 			relativePath = Zsign;
@@ -544,14 +548,6 @@
 				version = 4.104.0;
 			};
 		};
-		33F1A0A22E17B001006C1001 /* XCRemoteSwiftPackageReference "AltSign" */ = {
-			isa = XCRemoteSwiftPackageReference;
-			repositoryURL = "https://github.com/SideStore/AltSign";
-			requirement = {
-				branch = master;
-				kind = branch;
-			};
-		};
 		3346F8372DC6C68300C7D508 /* XCRemoteSwiftPackageReference "Nuke" */ = {
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/kean/Nuke";
@@ -594,7 +590,7 @@
 		};
 		33F1A0A02E17B001006C1001 /* AltSign-Dynamic */ = {
 			isa = XCSwiftPackageProductDependency;
-			package = 33F1A0A22E17B001006C1001 /* XCRemoteSwiftPackageReference "AltSign" */;
+			package = 33F1A0A22E17B001006C1001 /* XCLocalSwiftPackageReference "AltSign" */;
 			productName = "AltSign-Dynamic";
 		};
 		330F68FB2DBF7C8600D8C35D /* NimbleExtensions */ = {