chore: use the same name template as the release artifact

Author: meysam81

.goreleaser.yaml

@@ -45,8 +45,8 @@ binary_signs:
       - --output-certificate=${certificate}
       - ${artifact}
       - --yes
-    certificate: '${artifact}_{{ .Os }}_{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}{{ with .Mips }}_{{ . }}{{ end }}{{ if not (eq .Amd64 "v1") }}{{ .Amd64 }}{{ end }}.pem'
-    signature: '${artifact}_{{ .Os }}_{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}{{ with .Mips }}_{{ . }}{{ end }}{{ if not (eq .Amd64 "v1") }}{{ .Amd64 }}{{ end }}.sig'
+    certificate: '${artifact}_{{- tolower .Os }}_{{- if eq .Arch "amd64" }}x86_64{{- else if eq .Arch "386" }}i386{{- else }}{{ .Arch }}{{ end }}{{- if .Arm }}v{{ .Arm }}{{ end }}.pem'
+    signature: '${artifact}_{{- tolower .Os }}_{{- if eq .Arch "amd64" }}x86_64{{- else if eq .Arch "386" }}i386{{- else }}{{ .Arch }}{{ end }}{{- if .Arm }}v{{ .Arm }}{{ end }}.sig'
     output: true
 
 checksum: