add linux/riscv64 builds

.github/workflows/tests.yml

@@ -197,7 +197,7 @@ jobs:
       matrix:
         # run cross-compile in three batches parallel so the overall tests run faster
         targets:
-          - "linux/386 linux/amd64 linux/arm linux/arm64 linux/ppc64le linux/mips linux/mipsle linux/mips64 linux/mips64le linux/s390x"
+          - "linux/386 linux/amd64 linux/arm linux/arm64 linux/ppc64le linux/mips linux/mipsle linux/mips64 linux/mips64le linux/riscv64 linux/s390x"
 
           - "openbsd/386 openbsd/amd64 \
             freebsd/386 freebsd/amd64 freebsd/arm \

changelog/unreleased/pull-4180

@@ -0,0 +1,5 @@
+Enhancement: Add release binaries for riscv64 architecture on Linux
+
+We've added release binaries for riscv64 architecture on Linux.
+
+https://github.com/restic/restic/pull/4180

helpers/build-release-binaries/main.go

@@ -225,7 +225,7 @@ var defaultBuildTargets = map[string][]string{
 	"aix":     {"ppc64"},
 	"darwin":  {"amd64", "arm64"},
 	"freebsd": {"386", "amd64", "arm"},
-	"linux":   {"386", "amd64", "arm", "arm64", "ppc64le", "mips", "mipsle", "mips64", "mips64le", "s390x"},
+	"linux":   {"386", "amd64", "arm", "arm64", "ppc64le", "mips", "mipsle", "mips64", "mips64le", "riscv64", "s390x"},
 	"netbsd":  {"386", "amd64"},
 	"openbsd": {"386", "amd64"},
 	"windows": {"386", "amd64"},