chore: run CI with Go version from mod file (#462)

Using the go.mod to drive Go version choice in CI makes it easier to
upgrade to newer versions of Go. Since this CLI is shipped as a binary
and not meant to be used as a module, there's not much reason to do
matrix testing on multiple versions of Go.

This was broken out of #461 because the E2E test workflow uses a
`pull_request_target` trigger. That trigger means that the workflow
always uses the workflow configuration from the `main` branch, so it's
impossible for the E2E workflow to pass on that PR because--if we don't
merge this PR first--the workflow configuration has to be updated in
order to run on a different version of Go.

.github/workflows/codeql.yml

@@ -43,6 +43,11 @@ jobs:
  - name: Checkout repository
  uses: actions/checkout@v4
 
+ - name: Set up Go
+ uses: actions/setup-go@v5
+ with:
+ go-version-file: go.mod
+
  # Initializes the CodeQL tools for scanning.
  - name: Initialize CodeQL
  uses: github/codeql-action/init@v3

.github/workflows/docs.yml

@@ -25,9 +25,10 @@ jobs:
  key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
  restore-keys: |
  ${{ runner.os }}-go-
- - uses: actions/setup-go@v5
+ - name: Set up Go
+ uses: actions/setup-go@v5
  with:
- go-version: ${{ matrix.go }}
+ go-version-file: go.mod
  - run: mkdir -p ~/.config/equinix
  - run: touch ~/.config/equinix/metal.yaml
  - name: Build docs

.github/workflows/e2e-test.yml

@@ -37,14 +37,14 @@ jobs:
  runs-on: ubuntu-latest
  concurrency: 'e2e-test'
  steps:
- - name: Set up Go
- uses: actions/setup-go@v5
- with:
- go-version: '1.19'
  - name: Check out code into the Go module directory
  uses: actions/checkout@v4
  with:
  ref: ${{ github.event.pull_request.head.sha || github.ref }}
+ - name: Set up Go
+ uses: actions/setup-go@v5
+ with:
+ go-version-file: go.mod
  - name: Get dependencies
  run: go mod download
  - name: Run end-to-end tests

.github/workflows/golangci-lint.yml

@@ -16,10 +16,10 @@ jobs:
  name: lint
  runs-on: ubuntu-latest
  steps:
+ - uses: actions/checkout@v4
  - uses: actions/setup-go@v5
  with:
- go-version: 1.19
- - uses: actions/checkout@v4
+ go-version-file: go.mod
  - name: golangci-lint
  uses: golangci/golangci-lint-action@v3
  with:
@@ -43,4 +43,4 @@ jobs:
  # skip-pkg-cache: true
 
  # Optional: if set to true then the action don't cache or restore ~/.cache/go-build.
- # skip-build-cache: true
+ # skip-build-cache: true

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
  name: Set up Go
  uses: actions/setup-go@v5
  with:
- go-version: 1.19
+ go-version-file: go.mod
  -
  name: Run GoReleaser
  uses: goreleaser/goreleaser-action@v5

.github/workflows/test.yml

@@ -6,12 +6,12 @@ jobs:
  runs-on: ubuntu-latest
  timeout-minutes: 10
  steps:
+ - name: Check out code into the Go module directory
+ uses: actions/checkout@v4
  - name: Set up Go
  uses: actions/setup-go@v5
  with:
- go-version: '1.19'
- - name: Check out code into the Go module directory
- uses: actions/checkout@v4
+ go-version-file: go.mod
  - name: Get dependencies
  run: go mod download
  - name: Build