migrate to dotter

configs/fish/functions/_pure_is_inside_container.fish

@@ -0,0 +1,25 @@
+function _pure_is_inside_container \
+    --argument-names cgroup_namespace
+    set --query cgroup_namespace[1]; or set cgroup_namespace /proc/1/cgroup
+
+    set --local failure 1
+    if set --query pure_enable_container_detection; and test "$pure_enable_container_detection" = true
+        set --local success 0
+        if test -n "$container"
+            return $success
+        end
+
+        set --local os_name (uname -s)
+        # echo $os_name
+        if test "$os_name" = Linux
+            if _pure_detect_container_by_cgroup_method $cgroup_namespace
+                return $success
+            end
+
+            if _pure_detect_container_by_pid_method
+                return $success
+            end
+        end
+    end
+    return $failure
+end