fix: nix run

Author: samrose

.github/workflows/testinfra-nix.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set PostgreSQL versions
         id: set-versions
         run: |
-          VERSIONS=$(yq  '.postgres_major[]' ansible/vars.yml | jq  -R -s -c 'split("\n")[:-1]')
+          VERSIONS=$(nix run nixpkgs#yq --  '.postgres_major[]' ansible/vars.yml | nix run nixpkgs#jq --  -R -s -c 'split("\n")[:-1]')
           echo "postgres_versions=$VERSIONS" >> $GITHUB_OUTPUT
 
   test-ami-nix:
@@ -62,13 +62,10 @@ jobs:
       - name: Set PostgreSQL version environment variable
         run: echo "POSTGRES_MAJOR_VERSION=${{ matrix.postgres_version }}" >> $GITHUB_ENV
 
-      - name: Install yq & jq
-        run: |
-          nix profile install nixpkgs#yq nixpkgs#jq
 
       - name: Generate common-nix.vars.pkr.hcl
         run: |
-          PG_VERSION=$(yq '.postgres_release["postgres'${{ matrix.postgres_version }}'"]' ansible/vars.yml)
+          PG_VERSION=$(nix run nixpkgs#yq -- '.postgres_release["postgres'${{ matrix.postgres_version }}'"]' ansible/vars.yml)
           PG_VERSION=$(echo $PG_VERSION | tr -d '"')  # Remove any surrounding quotes
           echo 'postgres-version = "'$PG_VERSION'"' > common-nix.vars.pkr.hcl
           # Ensure there's a newline at the end of the file