ci: use --offline mode to lint workflows TDE-1149 TDE-1143 (#540)

#### Motivation

The current process of linting the workflows is complex as we need to
publish them on the kubernetes cluster. Using an offline mode makes
things simpler and quicker, removing the connection to the cluster.

#### Modification

Use the `--offline` mode to run `argo lint`, rather than linting from
the resources deployed on the cluster.

#### Checklist

- [ ] Tests updated
- [ ] Docs updated
- [X] Issue linked in Title

.github/workflows/main.yml

@@ -13,6 +13,17 @@ jobs:
       - name: Run actionlint to check workflow files
         run: docker run --volume="${PWD}:/repo" --workdir=/repo actionlint -color
 
+      - name: Install Argo
+        run: |
+          curl -sLO https://github.com/argoproj/argo-workflows/releases/download/v3.5.5/argo-linux-amd64.gz
+          gunzip argo-linux-amd64.gz
+          chmod +x argo-linux-amd64
+          ./argo-linux-amd64 version
+
+      - name: Lint workflows
+        run: |
+          ./argo-linux-amd64 lint --offline templates/ workflows/
+
   deploy-prod:
     runs-on: ubuntu-latest
     concurrency: deploy-prod-${{ github.ref }}
@@ -84,62 +95,6 @@ jobs:
         if: steps.get-infra-changes.outputs.run_infra == 'true'
         run: |
           kubectl apply -f dist/
-          # FIXME since `WATCH_CONTROLLER_SEMAPHORE_CONFIGMAPS=false` we need to restart argo-workflow-controller
-          # to make sure ConfigMap changes are taken into account
-          kubectl rollout restart deployment argo-workflows-workflow-controller -n argo
-
-      - name: Install Argo
-        run: |
-          curl -sLO https://github.com/argoproj/argo-workflows/releases/download/v3.4.0-rc2/argo-linux-amd64.gz
-          gunzip argo-linux-amd64.gz
-          chmod +x argo-linux-amd64
-          ./argo-linux-amd64 version
-
-      - name: Lint workflows
-        if: github.ref != 'refs/heads/master'
-        run: |
-          # Create test namespace
-          kubectl create namespace "$GITHUB_SHA"
-
-          # Create copy of Workflows files to change their namespaces
-          mkdir test
-          cp -r workflows/ test/workflows/ 
-
-          # Deploy templates in the test namespace
-          # Note: the templates have no default namespace so no need to modify them
-          kubectl apply -f templates/argo-tasks/ --namespace "$GITHUB_SHA"
-
-          # Find all workflows that have kind "WorkflowTemplate"
-          WORKFLOWS=$(grep -R -H '^kind: WorkflowTemplate$' test/workflows/ | cut -d ':' -f1)
-          # For each workflow template attempt to deploy it using kubectl
-          for wf in $WORKFLOWS; do
-              # Change namespace in files
-              sed -i "/^\([[:space:]]*namespace: \).*/s//\1$GITHUB_SHA/" "$wf"
-              kubectl apply -f "$wf" --namespace "$GITHUB_SHA"
-          done
-
-          # Find all cron workflows that have kind "CronWorkflow"
-          CRON_WORKFLOWS=$(grep -R -H '^kind: CronWorkflow$' test/workflows/ | cut -d ':' -f1)
-          # For each cron workflow attempt to deploy it using kubectl
-          for cwf in $CRON_WORKFLOWS; do
-            # Change namespace in files
-              sed -i "/^\([[:space:]]*namespace: \).*/s//\1$GITHUB_SHA/" "$cwf"
-              kubectl apply -f "$cwf" --namespace "$GITHUB_SHA"
-          done
-
-          # Finally lint the templates
-          ./argo-linux-amd64 lint templates/ -n "$GITHUB_SHA"
-          ./argo-linux-amd64 lint test/workflows/ -n "$GITHUB_SHA"
-
-      - name: Delete Test namespace
-        if: always()
-        run: |
-          # Delete the test namespace
-          stderr_tmp="$(mktemp --directory)/stderr"
-          if ! kubectl delete namespaces "$GITHUB_SHA" 2> >(tee "$stderr_tmp" >&2)
-          then 
-              grep -q 'Error from server (NotFound): namespaces ".*" not found' "$stderr_tmp"
-          fi
 
       - name: Deploy workflows
         if: github.ref == 'refs/heads/master'