fix: add REPO_BRANCH and use it in git clone

- Add REPO_BRANCH env var (currently fix/eca-copilot-instructions-and-callnotes)
  pointing to the branch with dynamic path fixes and HTTPS module source
- Pass --branch to git clone so CodeBuild checks out the right code
- Update REPO_BRANCH to 'main' once the fix branch is merged

buildspec.yml

@@ -22,6 +22,7 @@ env:
     REPO_HOST: "github.e.it.census.gov"
     REPO_ORG: "SCT-Engineering"
     REPO_NAME: "terraform-eks-deployment"
+    REPO_BRANCH: "fix/eca-copilot-instructions-and-callnotes"  # update to main once merged
     # Disable TLS verification for Census GHE (Census CA cert not trusted by default)
     GIT_SSL_NO_VERIFY: "true"
     TF_CLI_ARGS: "-no-color"
@@ -46,7 +47,7 @@ phases:
       - |
         git config --global credential.helper \
           "!f() { echo username=x-access-token; echo password=${GITHUB_TOKEN}; }; f"
-        git clone --depth 1 \
+        git clone --depth 1 --branch "${REPO_BRANCH}" \
           "https://${REPO_HOST}/${REPO_ORG}/${REPO_NAME}.git" \
           /tmp/eks-deploy
       - echo "Cloned ${REPO_ORG}/${REPO_NAME} @ $(git -C /tmp/eks-deploy rev-parse --short HEAD)"