Update golang version in runner

Also don't build twice.

Author: dougszumski

.github/workflows/pull_request.yml

@@ -14,13 +14,10 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: '1.20'
+        go-version: '1.24'
 
     - name: Check style
       run: make style
 
-    - name: Check that we can compile the exporter
-      run: make build
-
-    - name: Check that we can build the docker container
+    - name: Build Docker container
       run: make docker-build