Update GitHub Actions workflows (#40)

Slide test versions window.
Check tags before releasing.
Add concurrency checks.

.github/workflows/go.yaml

@@ -16,16 +16,24 @@ on:
 permissions:
  contents: read
 
+# Concurrency ensures that only a single workflow using the same concurrency group will run at a time.
+# When a workflow is queued in the same repository and concurrency group, any workflow in progress will be cancelled.
+# This concurrency group is keyed to the 'ref' property in the 'github' context, to map back to the branch/tag that
+# triggered this workflow run.
+concurrency:
+ cancel-in-progress: true
+ group: make_all_${{ github.ref }}
+
 jobs:
  build:
  name: Test and lint and build
 
  strategy:
  matrix:
  go-version:
- - 1.14.x
  - 1.15.x
  - 1.16.x
+ - 1.17.x
  platform:
  - ubuntu-latest
  - macos-latest

.github/workflows/release.yaml

@@ -8,14 +8,40 @@ on:
 permissions:
  contents: write
 
+# Concurrency ensures that only a single workflow using the same concurrency group will run at a time.
+# When a workflow is queued in the same repository and concurrency group, any workflow in progress will be cancelled.
+# This concurrency group is keyed to the 'ref' property in the 'github' context, to map back to the branch/tag that
+# triggered this workflow run.
+concurrency:
+ cancel-in-progress: true
+ group: release_${{ github.ref }}
+
 jobs:
+ check-tag:
+ runs-on: ubuntu-latest
+
+ steps:
+ - name: Check out ${{ github.repository }} - all history
+ uses: actions/checkout@v2
+ with:
+ fetch-depth: 0
+
+ - name: Confirm that the 'main' branch contains the '${{ github.ref }}' tag
+ run: >
+ git branch --all --contains '${{ github.ref }}' --no-column --format='%(refname)'
+ | grep -c '\/main$'
+
  goreleaser:
  runs-on: ubuntu-latest
+
+ needs:
+ - check-tag
+
  steps:
  - name: Checkout
  uses: actions/checkout@v2
  with:
- fetch-depth: 0
+ fetch-depth: 1
 
  - name: Set up Go
  uses: actions/setup-go@v2