ci(hex): install phx_new before publish test runs

Align Hex publish workflows with CI library_tests so InstallFixture can run mix phx.new.

Author: szTheory

.github/workflows/hex-publish.yml

@@ -59,6 +59,10 @@ jobs:
           mix local.hex --force
           mix local.rebar --force
 
+      # Matches library_tests in ci.yml: InstallFixture shells out to mix phx.new.
+      - name: Install phx_new archive
+        run: mix archive.install --force hex phx_new
+
       - name: Verify release version in mix.exs
         run: grep -n "@version \"${{ inputs.release_version }}\"" mix.exs
 

.github/workflows/release-please.yml

@@ -87,6 +87,10 @@ jobs:
           mix local.hex --force
           mix local.rebar --force
 
+      # Matches library_tests in ci.yml: InstallFixture shells out to mix phx.new.
+      - name: Install phx_new archive
+        run: mix archive.install --force hex phx_new
+
       - name: Fetch library deps
         run: mix deps.get