Pin third-party GitHub actions (#78)

Author: davidcornu

.github/workflows/health_check.yml

@@ -9,10 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@1a615958ad9d422dd932dc1d5823942ee002799f # v1.227.0
         with:
           ruby-version: 3.0.2
           bundler-cache: true
@@ -24,7 +24,7 @@ jobs:
 
       - name: Notify slack
         if: failure()
-        uses: kpritam/slack-job-status-action@v1
+        uses: kpritam/slack-job-status-action@54eea0dd141dd572d7fbbe96416e9c5d8ba57976 # v0.1.2
         with:
           job-status: ${{ job.status }}
           slack-bot-token: ${{ secrets.SLACK_BOT_TOKEN }}

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
       - uses: chrnorm/deployment-action@releases/v1
         name: Create GitHub deployment
@@ -23,7 +23,7 @@ jobs:
           environment: production
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@1a615958ad9d422dd932dc1d5823942ee002799f # v1.227.0
         with:
           ruby-version: 2.7.1
 
@@ -59,4 +59,4 @@ jobs:
           token: "${{ github.token }}"
           target_url: ${{ env.TARGET_URL }}
           state: "failure"
-          deployment_id: ${{ steps.deployment.outputs.deployment_id }}
+          deployment_id: ${{ steps.deployment.outputs.deployment_id }}

.github/workflows/test.yml

@@ -17,10 +17,10 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
       - name: Setup Ruby ${{ matrix.ruby-version }}
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@1a615958ad9d422dd932dc1d5823942ee002799f # v1.227.0
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true