Improve CI workflow (#422)

* Enables cache of `go install`'d binaries
* Drops unnecessary `fetch-depth: 1` (default)
* Removes unnecessary step `name:`s
* Reorders so that we run longest steps last (test/conformance) and move
`format` / `checkgenerate` earlier

Author: stefanvanburen

.github/workflows/ci.yaml

@@ -2,11 +2,11 @@ name: CI
 on:
   push:
     branches: [main]
-    tags: ['v*']
+    tags: ["v*"]
   pull_request:
     branches: [main]
   schedule:
-    - cron: '15 22 * * *'
+    - cron: "15 22 * * *"
   workflow_dispatch: {} # support manual runs
 permissions:
   contents: read
@@ -21,33 +21,24 @@ jobs:
         resolution: ["highest", "lowest-direct"]
     env:
       # Shared env variables for all the tests
-      UV_RESOLUTION: '${{ matrix.resolution }}'
+      UV_RESOLUTION: "${{ matrix.resolution }}"
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v6
-        with:
-          fetch-depth: 1
-      - name: Install Go
-        uses: actions/setup-go@v6
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
         with:
           go-version: stable
-          cache: false
+          # We use this to install `buf`, and the `buf` version is controlled by the Makefile.
+          cache-dependency-path: Makefile
       - uses: astral-sh/setup-uv@v7
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install dependencies
-        run: make install
-      - name: Lint
-        run: make lint
-      - name: Execute tests
-        run: make test
-      - name: Test conformance
-        run: make conformance
-      - name: Format
-        run: make format
+      - run: make install
+      - run: make lint
+      - run: make format
       # When running with matrix.resolution == highest, we expect uv.lock to change, but we don't want that file checked in.
       - if: matrix.resolution == 'lowest-direct'
-        name: Check generated
         run: make checkgenerate
         env:
           BUF_TOKEN: ${{ secrets.BUF_TOKEN }}
+      - run: make test
+      - run: make conformance