ci: pin third-party actions to commit SHAs

Pin actions/checkout, actions/setup-go, and goreleaser-action to
the commit SHA their current major-version tag points to, with the
tag preserved as a comment. Prevents an upstream tag move from
silently changing what runs in CI.

Author: emptyhammond

.github/workflows/ci.yml

@@ -16,11 +16,11 @@ jobs:
       matrix:
         go-version: ['1.22', '1.23']
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           persist-credentials: false
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
         with:
           go-version: ${{ matrix.go-version }}
 

.github/workflows/release.yml

@@ -12,17 +12,17 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
         with:
           fetch-depth: 0
           persist-credentials: false
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
         with:
           go-version: '1.22'
           cache: false
 
-      - uses: goreleaser/goreleaser-action@v6
+      - uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
         with:
           version: '~> v2'
           args: release --clean