bazel_4: add default PATH for local actions if it is not set.

https://github.com/NixOS/nixpkgs/issues/94222
fixup1

pkgs/development/tools/build-managers/bazel/bazel_4/actions_path.patch

@@ -0,0 +1,21 @@
+diff --git a/src/main/java/com/google/devtools/build/lib/exec/local/PosixLocalEnvProvider.java b/src/main/java/com/google/devtools/build/lib/exec/local/PosixLocalEnvProvider.java
+index 6fff2af..7e2877e 100755
+--- a/src/main/java/com/google/devtools/build/lib/exec/local/PosixLocalEnvProvider.java
++++ b/src/main/java/com/google/devtools/build/lib/exec/local/PosixLocalEnvProvider.java
+@@ -47,6 +47,16 @@ public final class PosixLocalEnvProvider implements LocalEnvProvider {
+       Map<String, String> env, BinTools binTools, String fallbackTmpDir) {
+     ImmutableMap.Builder<String, String> result = ImmutableMap.builder();
+     result.putAll(Maps.filterKeys(env, k -> !k.equals("TMPDIR")));
++
++    // In case we are running on NixOS.
++    // If bash is called with an unset PATH on this platform,
++    // it will set it to /no-such-path and default tools will be missings.
++    // See, https://github.com/NixOS/nixpkgs/issues/94222
++    // So we ensure that minimal dependencies are present.
++    if (!env.containsKey("PATH")){
++        result.put("PATH", "@actionsPathPatch@");
++    }
++ 
+     String p = clientEnv.get("TMPDIR");
+     if (Strings.isNullOrEmpty(p)) {
+       // Do not use `fallbackTmpDir`, use `/tmp` instead. This way if the user didn't export TMPDIR

pkgs/development/tools/build-managers/bazel/bazel_4/default.nix

@@ -208,6 +208,11 @@ stdenv.mkDerivation rec {
       strictActionEnvPatch = defaultShellPath;
     })
 
+    (substituteAll {
+      src = ./actions_path.patch;
+      actionsPathPatch = defaultShellPath;
+    })
+
     # bazel reads its system bazelrc in /etc
     # override this path to a builtin one
     (substituteAll {