ci: container image and testnet deployment integrated to all relevant…

… stages of the pipeline

* `integration:deployment` - deploys to testenet
* `integration:prerelease` - deploys to GitLab container registry as `testnet`
* `release:deployment:branch` - deploys to mainnet
* `release:deployment:tag` - deploys to mainnet
* `release:distribution` - deploys to GitLab container registry as `mainnet`

mainnet deployment is still a stub

.env.example

@@ -1,32 +1,3 @@
-# Set the TMPDIR to be used
-TMPDIR="$TMPDIR"
-
-# Accessing AWS for testnet.polykey.io and mainnet.polykey.io deployment
-AWS_DEFAULT_REGION='ap-southeast-2'
-AWS_ACCESS_KEY_ID=
-AWS_SECRET_ACCESS_KEY=
-
-# Container registry domain
-CONTAINER_REGISTRY='015248367786.dkr.ecr.ap-southeast-2.amazonaws.com'
-
-# Container repository
-CONTAINER_REPOSITORY="$CONTAINER_REGISTRY/polykey"
-
-# Accessing ECR for testnet.polykey.io and mainnet.polykey.io
-# Path to container registry authentication file used by `skopeo`
-# The file has the same contents as `DOCKER_AUTH_CONFIG`
-# Use this command to acquire the auth file at `./tmp/auth.json`:
-# ```
-# aws ecr get-login-password --region ap-southeast-2 \
-# | \
-# skopeo login \
-#   --username AWS \
-#   --password-stdin \
-#   $CONTAINER_REPOSITORY \
-#   --authfile=./tmp/auth.json
-# ```
-# REGISTRY_AUTH_FILE=
-
 # Unused atm (jest sets this to `test`)
 NODE_ENV=development
 
@@ -41,3 +12,19 @@ NODE_ENV=development
 
 # If set, indicates that `PK_TEST_COMMAND` is targetting docker
 # PK_TEST_COMMAND_DOCKER=
+# Accessing AWS for testnet.polykey.io and mainnet.polykey.io deployment
+AWS_DEFAULT_REGION='ap-southeast-2'
+AWS_ACCESS_KEY_ID=
+AWS_SECRET_ACCESS_KEY=
+
+# Path to container registry authentication file used by `skopeo`
+# The file has the same contents as `DOCKER_AUTH_CONFIG`
+# Use this command to acquire the auth file at `./tmp/auth.json`:
+# ```
+# printf 'PASSWORD' | skopeo login \
+#   --username 'USERNAME' \
+#   --password-stdin \
+#   $CI_REGISTRY_IMAGE \
+#   --authfile=./tmp/auth.json
+# ```
+# REGISTRY_AUTH_FILE=