ci: fix direnv/gha path integration

Author: josheppinette

.github/workflows/pre-commit.yml

@@ -14,6 +14,7 @@ jobs:
       - run: nix profile add .#direnv
       - run: |
           direnv allow
+          direnv exec . sh -c 'echo $PATH' > "$GITHUB_PATH"
           direnv export gha >> "$GITHUB_ENV"
       - run: |
           pip install -r requirements/pre-commit.txt

.github/workflows/test.yml

@@ -14,6 +14,7 @@ jobs:
       - run: nix profile add .#direnv
       - run: |
           direnv allow
+          direnv exec . sh -c 'echo $PATH' > "$GITHUB_PATH"
           direnv export gha >> "$GITHUB_ENV"
       - run: |
           pip install -r requirements/test.txt