`docker_push` fails for example acr

[Menghua1]

Describe the issue: When test the example acr of module avm-res-app-containerapp, it returns the error below. However, if the VPN is disconnected before the docker_push, it eventually runs successfully.

Module Version: 0.1.0

Examples: acr

Repro Steps:

1. Execute commands: azd login, az login.
2. Clone terraform template code. E.g:todo-python-mongo-terraform
3. Copy and paste the example acr into main.tf.
4. Annotate the contents of the infra/output.tf file.
5. Run azd provision.

Expected behavior: The examples acr can be tested successfully.

@lonegunmanb and @jongio for notification.

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[!WARNING] Tagging the AVM Core Team (@Azure/avm-core-team-technical-terraform) due to a module owner or contributor having not responded to this issue within 3 business days. The AVM Core Team will attempt to contact the module owners/contributors directly.

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• To prevent further actions to take effect, the "Status: Response Overdue 🚩" label must be removed, once this issue has been responded to.
• To avoid this rule being (re)triggered, the ""Needs: Triage :mag:" label must be removed as part of the triage process (when the issue is first responded to)!

[!NOTE] This message was posted as per ITA01TF.

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[!CAUTION] This issue requires the AVM Core Team's (@Azure/avm-core-team-technical-terraform) immediate attention as it hasn't been responded to within 6 business days.

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[microsoft-github-policy-service[bot]]

[!WARNING] Tagging the AVM Core Team (@Azure/avm-core-team-technical-terraform) due to a module owner or contributor having not responded to this issue within 3 business days. The AVM Core Team will attempt to contact the module owners/contributors directly.

[!TIP]

• To prevent further actions to take effect, the "Status: Response Overdue 🚩" label must be removed, once this issue has been responded to.
• To avoid this rule being (re)triggered, the ""Needs: Triage :mag:" label must be removed as part of the triage process (when the issue is first responded to)!

[!NOTE] This message was posted as per ITA01TF.

[microsoft-github-policy-service[bot]]

[!CAUTION] This issue requires the AVM Core Team's (@Azure/avm-core-team-technical-terraform) immediate attention as it hasn't been responded to within 6 business days.

[!TIP]

• To avoid this rule being (re)triggered, the "Needs: Triage :mag:" and "Status: Response Overdue :triangular_flag_on_post:" labels must be removed when the issue is first responded to!
• Remove the "Needs: Immediate Attention :bangbang:" label once the issue has been responded to.

[!NOTE] This message was posted as per ITA02TF.