Pass the git ssh public key to concourse terraform

Get the generated git ssh public key and pass it as a variable to
concourse terraform, so that it can upload it to the git codecommit
user.

concourse/pipelines/create-deployer.yml

@@ -66,6 +66,13 @@ resources:
       versioned_file: id_rsa
       region_name: {{aws_region}}
 
+  - name: git-ssh-public-key
+    type: s3-iam
+    source:
+      bucket: {{state_bucket}}
+      versioned_file: git_id_rsa.pub
+      region_name: {{aws_region}}
+
   - name: concourse-cert
     type: s3-iam
     source:
@@ -217,6 +224,7 @@ jobs:
       passed: [vpc]
     - get: concourse-terraform-state
     - get: concourse-cert
+    - get: git-ssh-public-key
 
     - task: vpc-terraform-outputs-to-sh
       config:
@@ -270,6 +278,7 @@ jobs:
         - name: vpc-terraform-outputs
         - name: concourse-terraform-state
         - name: generate-concourse-cert
+        - name: git-ssh-public-key
         params:
           VAGRANT_IP: {{vagrant_ip}}
           TF_VAR_env: {{deploy_env}}
@@ -283,6 +292,7 @@ jobs:
           - |
             cp generate-concourse-cert/concourse.crt generate-concourse-cert/concourse.key .
             . vpc-terraform-outputs/tfvars.sh
+            export TF_VAR_git_rsa_id_pub=$(<git-ssh-public-key/git_id_rsa.pub)
             terraform_params=${VAGRANT_IP:+-var vagrant_cidr=$VAGRANT_IP/32}
             terraform apply ${terraform_params} \
               -var-file=paas-cf/terraform/{{aws_account}}.tfvars \