Replace APT package cache action

.github/dependabot.yml

@@ -11,7 +11,3 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
-    ignore:
-      # Versions >1.4.3 interfere with caching done by our own CI script,
-      # causing the dune binary not to be found anymore.
-      - dependency-name: "awalsh128/cache-apt-pkgs-action"

.github/workflows/ci.yml

@@ -109,12 +109,15 @@ jobs:
 
       - name: Install dependencies (Linux)
         if: runner.os == 'Linux'
-        uses: awalsh128/cache-apt-pkgs-action@v1.4.3
+        uses: gerlero/apt-install@v1.3.12
         with:
           # https://github.com/ocaml/setup-ocaml/blob/2f57267f071bc8547dfcb9433ff21d44fffef190/packages/setup-ocaml/src/unix.ts#L48
           # plus OPAM wants cmake
-          packages: bubblewrap darcs g++-multilib gcc-multilib mercurial musl-tools rsync cmake
-          version: v4
+          packages: >-
+            bubblewrap musl-tools rsync cmake
+            ${{ runner.arch == 'X64' && 'g++-multilib gcc-multilib' || '' }}
+          install-recommends: false
+          upgrade: false
 
       - name: Restore rewatch build cache
         id: rewatch-build-cache

.github/workflows/coverage.yml

@@ -40,10 +40,13 @@ jobs:
         run: yarn install
 
       - name: Install system dependencies
-        uses: awalsh128/cache-apt-pkgs-action@v1.4.3
+        uses: gerlero/apt-install@v1.3.12
         with:
-          packages: bubblewrap darcs g++-multilib gcc-multilib mercurial musl-tools rsync cmake
-          version: v4
+          packages: >-
+            bubblewrap musl-tools rsync cmake
+            ${{ runner.arch == 'X64' && 'g++-multilib gcc-multilib' || '' }}
+          install-recommends: false
+          upgrade: false
 
       # --- rewatch build cache ---------------------------------------------
       # `make coverage` shells out to `make` which builds rewatch; cache the