Fix how to promote to staging and prod environments

Fix how to get DOCKER_IMAGE_TAG:

  By using GITHUB_ENV, only the steps on the same job will be
able to get the value.  When trying to get it from steps from
different jobs the value is empty.

  This was causing issues to promote to staging because it was
trying to promote EVERYTHING in dev to staging.  Luckly there
was a check to not allow to overwrite the same tag, so things
that were already promoted couldn't be overwritten

  By using GITHUB_OUTPUT instead, it is now possible to get the
variable on any step from any subsequent job

Add deployment version verification for staging and production:

  The CI/CD pipeline has been updated to include a new step for
verifying the deployment version in the staging and production
environments.
  This ensures that the correct version of the
Docker image is deployed to each environment before running the
tests

Add set -ux to deployment verification script:

- -u will treat any unitialized variable as an error
- -x will print the command that is being executed

  This will make sure that cases where the EXPECTED_VERSION
not being passed won't cause any problem.
  One example where the variable was not set and the job succeeded:
https://github.com/NethermindEth/juno/actions/runs/9800486115/job/27062611554#step:3:15

  By using -x, it will be useful to understand exactly what's
the expected version, so no confusion will be made

Add Manual gate to run tests in production

  Since the deployment to production is a manual process, creating
a artificial environment makes it possible for the tests to run
only after a deployment is actually done.
  This avoids the issue where the tests will start to run without
the environment be ready.

.github/workflow-scripts/verify_deployment.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -ux
+
 URL=$1
 EXPECTED_VERSION=$2
 MAX_ATTEMPTS=30

.github/workflows/ci-cd-pipeline.yml

@@ -21,6 +21,8 @@ permissions:
 jobs:
   build_docker_image:
     runs-on: ubuntu-latest
+    outputs:
+      DOCKER_IMAGE_TAG: ${{ steps.set_tag.outputs.DOCKER_IMAGE_TAG }}
 
     steps:
       - name: Checkout
@@ -29,8 +31,15 @@ jobs:
           fetch-depth: 0
 
       - name: Define image tag
+        id: set_tag
         run: |
-          echo "DOCKER_IMAGE_TAG=$(git describe --tags)" >> $GITHUB_ENV
+          export DOCKER_IMAGE_TAG=$(git describe --tags)
+
+          # This one is to be able to use the image tag in the next steps in this job
+          echo "DOCKER_IMAGE_TAG=$DOCKER_IMAGE_TAG" >> $GITHUB_ENV
+
+          # This one is to be able to use the image tag in the next jobs
+          echo "DOCKER_IMAGE_TAG=$DOCKER_IMAGE_TAG" >> $GITHUB_OUTPUT
 
       - name: Setup Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -61,7 +70,8 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Verify Deployment Version (Dev)
-        run: bash .github/workflow-scripts/verify_deployment.sh ${{ secrets.DEV_SEPOLIA_URL }} ${{ env.DOCKER_IMAGE_TAG }}
+        run: |
+          bash .github/workflow-scripts/verify_deployment.sh ${{ secrets.DEV_SEPOLIA_URL }} ${{ needs.build_docker_image.outputs.DOCKER_IMAGE_TAG }}
 
   dev-starknet-rs-tests:
     needs: [validate_dev]
@@ -91,7 +101,11 @@ jobs:
 
       - name: Promote to Staging
         run: |
-          jf rt dpr juno/${{ env.DOCKER_IMAGE_TAG }} ${{ env.REPO_DEV }} ${{ env.REPO_STAGING }}
+          jf rt dpr juno/${{ needs.build_docker_image.outputs.DOCKER_IMAGE_TAG }} ${{ env.REPO_DEV }} ${{ env.REPO_STAGING }}
+
+      - name: Verify Deployment Version (Staging)
+        run: |
+          bash .github/workflow-scripts/verify_deployment.sh ${{ secrets.STAGING_SEPOLIA_URL }} ${{ needs.build_docker_image.outputs.DOCKER_IMAGE_TAG }}
 
   staging-starknet-rs-tests:
     needs: [promote_to_staging]
@@ -121,16 +135,26 @@ jobs:
 
       - name: Promote to Production
         run: |
-          jf rt dpr juno/${{ env.DOCKER_IMAGE_TAG }} ${{ env.REPO_STAGING }} ${{ env.REPO_PROD }}
+          jf rt dpr juno/${{ needs.build_docker_image.outputs.DOCKER_IMAGE_TAG }} ${{ env.REPO_STAGING }} ${{ env.REPO_PROD }}
 
-  prod-starknet-rs-tests:
+   test_in_production:
     needs: [promote_to_production]
+    runs-on: ubuntu-latest
+    environment:
+      name: ProductionTests  # Artificial gate to enforce manual approval
+    steps:
+      - name: Starting production tests
+        run: |
+          echo "Tests in production will start shortly."
+
+  prod-starknet-rs-tests:
+    needs: [test_in_production]
     uses: ./.github/workflows/starknet-rs-tests.yml
     secrets:
       STARKNET_RPC: ${{ secrets.PROD_SEPOLIA_URL }}/v0_6
 
   prod-starknet-js-tests:
-    needs: [promote_to_production]
+    needs: [test_in_production]
     uses: ./.github/workflows/starknet-js-tests.yml
     secrets:
       TEST_RPC_URL: ${{ secrets.PROD_SEPOLIA_URL }}/v0_7