Push latest Docker tag along with version tag (coder#4120)

Author: code-asher

ci/release-image/docker-bake.hcl

@@ -12,6 +12,9 @@ group "default" {
 
 target "code-server" {
     dockerfile = "ci/release-image/Dockerfile"
-    tags = ["docker.io/codercom/code-server:${VERSION}"]
+    tags = [
+        "docker.io/codercom/code-server:latest",
+        notequal("latest",VERSION) ? "docker.io/codercom/code-server:${VERSION}" : "",
+    ]
     platforms = ["linux/amd64", "linux/arm64"]
 }