CI: use rust-cache action for faster CI

rust-cache caches most of the directories we cached previously, while
additionally deleting files that we don't need in the cache.

Since the action already removes old files from the cache, we don't need
cargo-sweep any more.

Author: syphar

.github/workflows/ci.yml

@@ -17,34 +17,9 @@ jobs:
         with:
           toolchain: stable
           override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: install
-          args: cargo-sweep
 
-      - name: Cache directories
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/bin
-            ~/.cargo/git
-          key: cargo-test-dirs-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: cargo-test-dirs-
-      - name: Cache build
-        uses: actions/cache@v2
-        with:
-          path: target
-          key: cargo-test-build-${{ steps.install.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            cargo-test-build-${{ steps.install.outputs.rustc_hash }}-
-            cargo-test-build-
-
-      - name: Register artifacts
-        uses: actions-rs/cargo@v1
-        with:
-          command: sweep
-          args: --stamp
+      - name: restore build & cargo cache
+        uses: Swatinem/rust-cache@v1
 
       - name: Launch postgres and min.io
         run: |
@@ -76,12 +51,6 @@ jobs:
       - name: Clean up the database
         run: docker-compose down --volumes
 
-      - name: Clean unused artifacts
-        uses: actions-rs/cargo@v1
-        with:
-          command: sweep
-          args: --file
-
   fmt:
     name: Rustfmt
     runs-on: ubuntu-latest
@@ -112,42 +81,11 @@ jobs:
           toolchain: stable
           override: true
           components: clippy
-      - uses: actions-rs/cargo@v1
-        with:
-          command: install
-          args: cargo-sweep
 
-      - name: Cache directories
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/bin
-            ~/.cargo/git
-          key: cargo-clippy-dirs-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: cargo-clippy-dirs-
-      - name: Cache build
-        uses: actions/cache@v2
-        with:
-          path: target
-          key: cargo-clippy-${{ steps.install.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            cargo-clippy-${{ steps.install.outputs.rustc_hash }}-
-            cargo-clippy-
-
-      - name: Register artifacts
-        uses: actions-rs/cargo@v1
-        with:
-          command: sweep
-          args: --stamp
+      - name: restore build & cargo cache
+        uses: Swatinem/rust-cache@v1
 
       - uses: actions-rs/cargo@v1
         with:
           command: clippy
           args: --all-targets --workspace --locked -- -D warnings
-
-      - name: Clean unused artifacts
-        uses: actions-rs/cargo@v1
-        with:
-          command: sweep
-          args: --file