Added new variable to allow pre-deploy job specific environment variables to be set

Closes #44

See merge request !59

Add database migration Cloud Run job config

See merge request !58

This is initially planned to execute Django database migrations. However,
other use cases will exist I'm sure.

Update CHANGELOG

See merge request !57

Upgrade to v3 of the gcp-site-monitoring-module

See merge request !56

BREAKING CHANGE: The default SSL policy restricts TLS to >= 1.2 and
sets the SSL profile to MODERN.

BREAKING CHANGE: Upgrading to v3 of the gcp-site-monitoring module
will cause uptime check functions to be destroyed/re-created during the
next Terraform apply.

Add load balancer ssl policy and output

See merge request !55

ignore operation-id annotation

Closes #40

See merge request !54

fix: broken for_each on initial deploy

Closes #39

See merge request !53

chore: update changelog for release 6.0.0

See merge request !52

Fix multiple longstanding issues

Closes #7, #35, #37, and #38

See merge request !51

Currently uses sql_instance_connection_name which causes
issues when the provided value is not known until apply.

This removes the dependency on the deprecated hashicorp/template provider.

A map cannot have a key which depends on a resource which is unknown.
To resolve this issue I've refactored the map to have known key names.

Closes #38

update versions to allow compatibility with google provider version 4

Closes #36

See merge request !50

Ignore changes in vpc connector network

See merge request !47

Do not enable BETA launch-stage for referencing secrets

Closes #33

See merge request !45

As referencing Secret Manager secrets has moved to GA. See:
https://cloud.google.com/run/docs/release-notes#November_09_2021

Resolve "Add dashboard"

Closes #27

See merge request !44

The dashboard, defined in ./dashboard.json, contains:
- Request counts broken down by response code class (ignoring 404s).
- Request latencies for 50th, 95th and 99th percentile.
- Container CPU and memory utilisations for 50th, 95th and 99th percentile.
- Container instance count and billable instance time.