fix: for now keep nix and inherit env

Author: samrose

.github/workflows/ami-release-nix.yml

@@ -79,18 +79,18 @@ jobs:
           POSTGRES_MAJOR_VERSION: ${{ env.POSTGRES_MAJOR_VERSION }}
         run: |
           GIT_SHA=${{github.sha}}
-          sudo nix run github:supabase/postgres/${GIT_SHA}#packer -- init amazon-arm64-nix.pkr.hcl
+          sudo -E nix  run github:supabase/postgres/${GIT_SHA}#packer -- init amazon-arm64-nix.pkr.hcl
           # why is postgresql_major defined here instead of where the _three_ other postgresql_* variables are defined?
-          sudo nix run github:supabase/postgres/${GIT_SHA}#packer -- build -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}"  -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" -var "ansible_arguments=-e postgresql_major=${POSTGRES_MAJOR_VERSION}"  amazon-arm64-nix.pkr.hcl
+          sudo -E nix  run github:supabase/postgres/${GIT_SHA}#packer -- build -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}"  -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" -var "ansible_arguments=-e postgresql_major=${POSTGRES_MAJOR_VERSION}"  amazon-arm64-nix.pkr.hcl
 
       - name: Build AMI stage 2
         env:
           POSTGRES_MAJOR_VERSION: ${{ env.POSTGRES_MAJOR_VERSION }}
         run: |
           GIT_SHA=${{github.sha}}
-          sudo nix run github:supabase/postgres/${GIT_SHA}#packer -- init stage2-nix-psql.pkr.hcl
+          sudo -E nix  run github:supabase/postgres/${GIT_SHA}#packer -- init stage2-nix-psql.pkr.hcl
           POSTGRES_MAJOR_VERSION=${{ env.POSTGRES_MAJOR_VERSION }}
-          sudo nix run github:supabase/postgres/${GIT_SHA}#packer -- build -var "git_sha=${GIT_SHA}" -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var "postgres_major_version=${POSTGRES_MAJOR_VERSION}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" stage2-nix-psql.pkr.hcl
+          sudo -E nix  run github:supabase/postgres/${GIT_SHA}#packer -- build -var "git_sha=${GIT_SHA}" -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var "postgres_major_version=${POSTGRES_MAJOR_VERSION}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" stage2-nix-psql.pkr.hcl
 
       - name: Grab release version
         id: process_release_version

.github/workflows/testinfra-ami-build.yml

@@ -54,42 +54,20 @@ jobs:
       - name: Checkout Repo
         uses: supabase/postgres/.github/actions/shared-checkout@HEAD
 
-      - name: Diagnose existing Nix installation
+      - name: Remove existing DeterminateSystems Nix installation
         run: |
-          echo "=== Nix installation diagnostics ==="
+          # Use the built-in DeterminateSystems uninstaller
+          if [ -f /nix/nix-installer ]; then
+            echo "Found DeterminateSystems nix-installer, using built-in uninstaller"
+            sudo /nix/nix-installer uninstall --no-confirm || true
+          else
+            echo "No DeterminateSystems installer found to uninstall"
+          fi
           
-          # Check if nix command exists and where
-          which nix || echo "nix command not found in PATH"
-          ls -la /nix 2>/dev/null || echo "/nix directory does not exist"
-          
-          # Check installation method traces
-          echo "--- Checking for DeterminateSystems installer traces ---"
-          ls -la /nix/.nix-installer* 2>/dev/null || echo "No DeterminateSystems installer traces found"
-          cat /nix/.nix-installer* 2>/dev/null || echo "No installer receipt file"
-          
-          echo "--- Checking for cachix installer traces ---"
-          ls -la /etc/systemd/system/nix-daemon.service 2>/dev/null || echo "No systemd nix-daemon service"
-          systemctl status nix-daemon 2>/dev/null || echo "nix-daemon not running via systemd"
-          
-          echo "--- Checking for manual installation traces ---"
-          ls -la /etc/bash.bashrc | grep -C2 nix || echo "No nix in /etc/bash.bashrc"
-          ls -la /etc/profile | grep -C2 nix || echo "No nix in /etc/profile"
-          
-          echo "--- Checking nix store and configuration ---"
-          ls -la /nix/store 2>/dev/null | head -10 || echo "No /nix/store"
-          ls -la /etc/nix/ 2>/dev/null || echo "No /etc/nix directory"
-          cat /etc/nix/nix.conf 2>/dev/null || echo "No /etc/nix/nix.conf"
-          
-          echo "--- Checking user-level nix ---"
-          ls -la ~/.nix-* 2>/dev/null || echo "No user nix directories"
-          env | grep -i nix || echo "No nix environment variables"
-          
-          echo "--- Checking processes ---"
-          ps aux | grep -i nix || echo "No nix processes running"
-          
-          echo "--- Checking nix version and info ---"
-          nix --version 2>/dev/null || echo "Cannot get nix version"
-          nix show-config 2>/dev/null || echo "Cannot show nix config"
+          # Verify removal
+          echo "Verifying nix removal..."
+          which nix || echo "nix command no longer available"
+          ls -la /nix 2>/dev/null || echo "/nix directory removed"
 
       - name: Install nix
         uses: cachix/install-nix-action@v27