Restrict docker/deploy jobs to upstream repo, cancel concurrent test runs

.github/workflows/deploy.yml

@@ -8,6 +8,8 @@ jobs:
   deploy:
     name: Deploy
     runs-on: ubuntu-latest
+    if: github.repository == 'dask-contrib/dask-sql'
+
     steps:
       - uses: actions/checkout@v2
       - name: Cache local Maven repository

.github/workflows/docker.yml

@@ -11,6 +11,8 @@ jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub
     runs-on: ubuntu-latest
+    if: github.repository == 'dask-contrib/dask-sql'
+
     steps:
       - name: Check out the repo
         uses: actions/checkout@v2

.github/workflows/stylecheck.yml

@@ -2,6 +2,12 @@
 name: Python Style Check
 on: [pull_request]
 
+# When this workflow is queued, automatically cancel any previous running
+# or pending jobs from the same branch
+concurrency:
+  group: style-${{ github.head_ref }}
+  cancel-in-progress: true
+
 jobs:
   pre-commit:
     runs-on: ubuntu-latest

.github/workflows/test.yml

@@ -9,6 +9,12 @@ on:
       - main
   pull_request:
 
+# When this workflow is queued, automatically cancel any previous running
+# or pending jobs from the same branch
+concurrency:
+  group: test-${{ github.head_ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     # This build step should be similar to the deploy build, to make sure we actually test