Add registry manifest file

Author: carlpett

GNUmakefile

@@ -42,6 +42,8 @@ release: crossbuild
 		zip -j releases/terraform-provider-sops_$(RELEASE)_$$OSARCH.zip binaries/$(VERSION)/$$OSARCH/terraform-provider-sops_* > /dev/null; \
 		gh release upload $(VERSION) "releases/terraform-provider-sops_$(RELEASE)_$$OSARCH.zip#terraform-provider-sops_$(RELEASE)_$$OSARCH.zip"; \
 	done
+	@echo ">>> uploading manifest"
+	gh release upload $(VERSION) "terraform-registry-manifest.json#releases/terraform-provider-sops_$(RELEASE)_manifest.json"
 	@echo ">>> generating sha256sums:"
 	cd releases; sha256sum *.zip | tee terraform-provider-sops_$(RELEASE)_SHA256SUMS
 	gh release upload $(VERSION) "releases/terraform-provider-sops_$(RELEASE)_SHA256SUMS#terraform-provider-sops_$(RELEASE)_SHA256SUMS"

terraform-registry-manifest.json

@@ -0,0 +1,6 @@
+{
+  "version": 1,
+  "metadata": {
+    "protocol_versions": ["6.0"]
+  }
+}