[nongnu] elpa/nix-mode 38958e5203 413/500: Update install-nix-action in GitHub Action

[ELPA Syncer]

branch: elpa/nix-mode
commit 38958e52034689e55b4d426fceb880ed79df519e
Author: taku0 <mxxouy6x3m_github@tatapa.org>
Commit: taku0 <mxxouy6x3m_github@tatapa.org>

    Update install-nix-action in GitHub Action
    
    This should fix the following error:
    
    ```
    Error: Unable to process command 
'::add-path::/nix/var/nix/profiles/per-user/runner/profile/bin' successfully.
    Error: The `add-path` command is disabled. Please upgrade to using 
Environment Files or opt into unsecure command execution by setting the 
`ACTIONS_ALLOW_UNSECURE_COMMANDS` environment variable to `true`. For more 
information see: 
https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
    ```
    
    See also: https://github.com/cachix/install-nix-action/issues/50
---
 .github/workflows/test.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index c94e6cc82e..76622ab60e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - uses: cachix/install-nix-action@v10
+    - uses: cachix/install-nix-action@v12
     #- run: nix build
     - run: nix-build -E '(import ./.).defaultPackage.${builtins.currentSystem}'
     #- run: nix flake check