Split out future-proof tests from CI

.github/workflows/ci.yaml

@@ -2,8 +2,6 @@ name: CI
 on:
   pull_request:
   push:
-  schedule:
-    - cron: '23 1 * * *' # *-*-* 01:23:00 UTC
 
 permissions:
   contents: read
@@ -64,7 +62,6 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        deps: [latest, locked]
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -74,13 +71,6 @@ jobs:
         uses: cachix/install-nix-action@v20
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
-      - name: Flake update
-        if: matrix.deps == 'latest'
-        # https://github.com/actions/checkout/tree/v3.3.0#push-a-commit-using-the-built-in-token
-        run: |
-          git config user.name github-actions
-          git config user.email github-actions@github.com
-          nix flake update --commit-lock-file
       - name: Flake check
         run: nix flake check --no-update-lock-file --show-trace
       - name: Flake build
@@ -106,17 +96,3 @@ jobs:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
       - name: Nix build
         run: nix-build --show-trace
-
-  outdated:
-    name: Outdated
-    runs-on: ubuntu-latest
-    if: github.event_name != 'pull_request'
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Install cargo-outdated
-        uses: dtolnay/install@cargo-outdated
-      - name: cargo-outdated
-        run: |
-          rm Cargo.lock # Ignore trivially updatable compatible versions.
-          cargo outdated --workspace --exit-code 1

.github/workflows/future-proof.yaml

@@ -0,0 +1,53 @@
+name: Future proof tests
+on:
+  push:
+    branches:
+      - 'main'
+      - 'ci'
+  schedule:
+    - cron: '23 1 * * *' # *-*-* 01:23:00 UTC
+
+permissions:
+  contents: read
+
+env:
+  RUST_BACKTRACE: full
+
+jobs:
+  nix-flake-latest:
+    name: Flake package following latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v20
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Flake update
+        # https://github.com/actions/checkout/tree/v3.3.0#push-a-commit-using-the-built-in-token
+        run: |
+          git config user.name github-actions
+          git config user.email github-actions@github.com
+          nix flake update --commit-lock-file
+      - name: Flake check
+        run: nix flake check --no-update-lock-file --show-trace
+      - name: Flake build
+        run: nix build --no-update-lock-file --show-trace --print-build-logs
+
+  outdated:
+    name: Outdated
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install cargo-outdated
+        uses: dtolnay/install@cargo-outdated
+      - name: cargo-outdated
+        run: |
+          rm Cargo.lock # Ignore trivially updatable compatible versions.
+          cargo outdated --workspace --exit-code 1