chore: pass git hash to packer directly through a param

Author: pcnc

.github/workflows/ami-release-nix.yml

@@ -49,13 +49,13 @@ jobs:
         run: |
           packer init amazon-arm64-nix.pkr.hcl
           GIT_SHA=${{github.sha}}
-          packer build -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" -var "ansible_arguments="  amazon-arm64-nix.pkr.hcl
+          packer build -var "git_sha=${GIT_SHA}" -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" -var "ansible_arguments="  amazon-arm64-nix.pkr.hcl
 
       - name: Build AMI stage 2
         run: |
           packer init stage2-nix-psql.pkr.hcl
           GIT_SHA=${{github.sha}}
-          packer build -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" stage2-nix-psql.pkr.hcl
+          packer build -var "git_sha=${GIT_SHA}" -var "git-head-version=${GIT_SHA}" -var "packer-execution-id=${GITHUB_RUN_ID}" -var-file="development-arm.vars.pkr.hcl" -var-file="common-nix.vars.pkr.hcl" stage2-nix-psql.pkr.hcl
 
       - name: Grab release version
         id: process_release_version

common-nix.vars.pkr.hcl

@@ -1 +1 @@
-postgres-version = "15.6.1.111-rc2"
+postgres-version = "15.6.1.111-rc3"