diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index cf2a660..815f95d 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -19,35 +19,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      # setup-php installs PHP 8.3+ through php-builder, which apt-installs ~70
-      # -dev packages before unpacking the build (#178). Ubuntu's own image
-      # deletes the .debs after install, so every job re-downloads them from
-      # the archive. Keep them and restore them from the cache server, which
-      # lives in the cluster, turning a WAN download into a local one.
-      #
-      # The dep list is the same for every PHP version on the builder path, so
-      # one shared key serves them all. Only the .debs are cached, never
-      # /var/lib/apt/lists — a stale index is how you get 404s on install.
-      - name: Keep downloaded .debs
-        run: |
-          sudo rm -f /etc/apt/apt.conf.d/docker-clean
-          echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' \
-            | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
-
-      - name: Cache apt packages
-        uses: actions/cache@v4
-        with:
-          path: /var/cache/apt/archives/*.deb
-          key: apt-php-builder-deps-${{ runner.arch }}-v1
-
-      # Temporary, for #178: shows whether the cache actually served the
-      # builder's dependencies, and times the step that consumes them.
-      - name: Report restored .debs
-        run: |
-          echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
-          echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
-          date -u +'setup-php start: %H:%M:%S'
-
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -55,7 +26,7 @@ jobs:
           tools: composer:v2
 
       - name: Cache Composer packages
-        uses: actions/cache@v4
+        uses: actions/cache@v3
         with:
           path: ~/.composer/cache
           key: composer-${{ hashFiles('composer.json') }}
@@ -83,35 +54,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      # setup-php installs PHP 8.3+ through php-builder, which apt-installs ~70
-      # -dev packages before unpacking the build (#178). Ubuntu's own image
-      # deletes the .debs after install, so every job re-downloads them from
-      # the archive. Keep them and restore them from the cache server, which
-      # lives in the cluster, turning a WAN download into a local one.
-      #
-      # The dep list is the same for every PHP version on the builder path, so
-      # one shared key serves them all. Only the .debs are cached, never
-      # /var/lib/apt/lists — a stale index is how you get 404s on install.
-      - name: Keep downloaded .debs
-        run: |
-          sudo rm -f /etc/apt/apt.conf.d/docker-clean
-          echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' \
-            | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
-
-      - name: Cache apt packages
-        uses: actions/cache@v4
-        with:
-          path: /var/cache/apt/archives/*.deb
-          key: apt-php-builder-deps-${{ runner.arch }}-v1
-
-      # Temporary, for #178: shows whether the cache actually served the
-      # builder's dependencies, and times the step that consumes them.
-      - name: Report restored .debs
-        run: |
-          echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
-          echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
-          date -u +'setup-php start: %H:%M:%S'
-
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -121,7 +63,7 @@ jobs:
           tools: composer:v2
 
       - name: Cache Composer packages
-        uses: actions/cache@v4
+        uses: actions/cache@v3
         with:
           path: ~/.composer/cache
           key: ${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
@@ -155,35 +97,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      # setup-php installs PHP 8.3+ through php-builder, which apt-installs ~70
-      # -dev packages before unpacking the build (#178). Ubuntu's own image
-      # deletes the .debs after install, so every job re-downloads them from
-      # the archive. Keep them and restore them from the cache server, which
-      # lives in the cluster, turning a WAN download into a local one.
-      #
-      # The dep list is the same for every PHP version on the builder path, so
-      # one shared key serves them all. Only the .debs are cached, never
-      # /var/lib/apt/lists — a stale index is how you get 404s on install.
-      - name: Keep downloaded .debs
-        run: |
-          sudo rm -f /etc/apt/apt.conf.d/docker-clean
-          echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' \
-            | sudo tee /etc/apt/apt.conf.d/99keep-downloaded-packages >/dev/null
-
-      - name: Cache apt packages
-        uses: actions/cache@v4
-        with:
-          path: /var/cache/apt/archives/*.deb
-          key: apt-php-builder-deps-${{ runner.arch }}-v1
-
-      # Temporary, for #178: shows whether the cache actually served the
-      # builder's dependencies, and times the step that consumes them.
-      - name: Report restored .debs
-        run: |
-          echo "restored .debs: $(ls /var/cache/apt/archives/*.deb 2>/dev/null | wc -l)"
-          echo "restored size:  $(du -sh /var/cache/apt/archives 2>/dev/null | cut -f1)"
-          date -u +'setup-php start: %H:%M:%S'
-
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with: