ci(proto): pin runner version to ubuntu-20.04

.github/workflows/proto.yaml

@@ -20,12 +20,12 @@ env:
   ERC_REPOSITORY: "protogen"
   IMAGE_TAG: "0.2.0"
   DOCKERFILE: ".github/images/protogen.Dockerfile"
-
+  ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
 jobs:
   # Checks if protogen image exists in docker registry
   protogen-exists:
       name: Check protogen exists
-      runs-on: ubuntu-latest
+      runs-on: ubuntu-20.04
       container: amazon/aws-cli
       outputs:
         # 'failure' -  when no image with such tag exists 
@@ -34,7 +34,7 @@ jobs:
 
       steps:
         - name: Configure AWS Credentials
-          uses: aws-actions/configure-aws-credentials@v4
+          uses: aws-actions/configure-aws-credentials@v1-node16
           with:
             aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
             aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
@@ -54,13 +54,13 @@ jobs:
   protogen-create:
     name: Create protogen image
     needs: protogen-exists
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v3
 
       - name: Configure AWS Credentials
-        uses: aws-actions/configure-aws-credentials@v4f
+        uses: aws-actions/configure-aws-credentials@v1-node16
         with:
           aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
@@ -85,7 +85,7 @@ jobs:
 
   proto-lint:
     name: Lint protobuf files
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v3
@@ -96,7 +96,7 @@ jobs:
 
   proto-break-check:
     name: Detect breaking changes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - uses: bufbuild/buf-setup-action@v1.9.0