build: Add restart Testnet solver and job creator actions

.github/workflows/testnet_restart_job_creator.yml

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+name: Restart Testnet job creator
+
+# on: workflow_dispatch
+on:
+  push:
+    branches:
+      - bgins/build-deploy-testnet
+
+jobs:
+  job-creator-restart:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restart job-creator container
+        uses: appleboy/ssh-action@master
+        with:
+          host: ${{ secrets.TESTNET_EC2_HOST_JOB_CREATOR }}
+          username: ${{ secrets.TESTNET_EC2_USERNAME_JOB_CREATOR }}
+          key: ${{ secrets.TESTNET_EC2_PRIVATE_KEY_JOB_CREATOR }}
+          script_stop: true
+          script: |
+            docker restart job-creator || true

.github/workflows/testnet_restart_solver.yml

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+name: Restart Testnet solver
+
+# on: workflow_dispatch
+on:
+  push:
+    branches:
+      - bgins/build-deploy-testnet
+
+jobs:
+  solver-restart:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restart solver container
+        uses: appleboy/ssh-action@master
+        with:
+          host: ${{ secrets.TESTNET_EC2_HOST_SOLVER }}
+          username: ${{ secrets.TESTNET_EC2_USERNAME_SOLVER }}
+          key: ${{ secrets.TESTNET_EC2_PRIVATE_KEY_SOLVER }}
+          script_stop: true
+          script: |
+            docker restart solver || true