Added config.nims for musl

.dockerignore

@@ -1,3 +1,4 @@
 .git
 nimd
 src/main
+artix.iso

config.nims

@@ -0,0 +1,52 @@
+from macros import error
+from ospaths import splitFile, `/`
+
+# -d:musl
+when defined(musl):
+  var muslGccPath: string
+  echo "  [-d:musl] Building a static binary using musl .."
+  muslGccPath = findExe("musl-gcc")
+  # echo "debug: " & muslGccPath
+  if muslGccPath == "":
+    error("'musl-gcc' binary was not found in PATH.")
+  switch("gcc.exe", muslGccPath)
+  switch("gcc.linkerexe", muslGccPath)
+  switch("passL", "-static")
+
+
+proc binOptimize(binFile: string) =
+  ## Optimize size of the ``binFile`` binary.
+  echo ""
+  if findExe("strip") != "":
+    echo "Running 'strip -s' .."
+    exec "strip -s " & binFile
+  if findExe("upx") != "":
+    # https://github.com/upx/upx/releases/
+    echo "Running 'upx --best' .."
+    exec "upx --best " & binFile
+
+# nim musl foo.nim
+task musl, "Builds an optimized static binary using musl":
+  ## Usage: nim musl <.nim file path>
+  let
+    numParams = paramCount()
+  if numParams != 2:
+    error("The 'musl' sub-command needs exactly 1 argument, the Nim file (but " &
+      $(numParams-1) & " were detected)." &
+      "\n  Usage Example: nim musl FILE.nim.")
+
+  let
+    nimFile = paramStr(numParams) ## The nim file name *must* be the last.
+    (dirName, baseName, _) = splitFile(nimFile)
+    binFile = dirName / baseName  # Save the binary in the same dir as the nim file
+    nimArgs = "c -d:musl -d:release --opt:size " & nimFile
+  # echo "[debug] nimFile = " & nimFile & ", binFile = " & binFile
+
+  # Build binary
+  echo "\nRunning 'nim " & nimArgs & "' .."
+  selfExec nimArgs
+
+  # Optimize binary
+  binOptimize(binFile)
+
+  echo "\nCreated binary: " & binFile