Build darwin/arm64 binaries for Apple M1

.github/workflows/tests.yml

@@ -200,7 +200,7 @@ jobs:
 
           - "freebsd/386 freebsd/amd64 freebsd/arm \
             aix/ppc64 \
-            darwin/amd64 \
+            darwin/amd64 darwin/arm64 \
             netbsd/386 netbsd/amd64 \
             windows/386 windows/amd64 \
             solaris/amd64"

changelog/unreleased/issue-3377

@@ -0,0 +1,6 @@
+Enhancement: Add release binaries for Apple Silicon
+
+We've added release binaries for macOS on Apple Silicon.
+
+https://github.com/restic/restic/issues/3377
+https://github.com/restic/restic/pull/3394

helpers/build-release-binaries/main.go

@@ -224,7 +224,7 @@ func buildTargets(sourceDir, outputDir string, targets map[string][]string) {
 // ATTENTION: the list of architectures must be in sync with .github/workflows/tests.yml!
 var defaultBuildTargets = map[string][]string{
 	"aix":     {"ppc64"},
-	"darwin":  {"amd64"},
+	"darwin":  {"amd64", "arm64"},
 	"freebsd": {"386", "amd64", "arm"},
 	"linux":   {"386", "amd64", "arm", "arm64", "ppc64le", "mips", "mipsle", "mips64", "mips64le"},
 	"netbsd":  {"386", "amd64"},