diff --git a/.gitea/scripts/build.sh b/.gitea/scripts/build.sh
index 5c9c63a..92fd879 100755
--- a/.gitea/scripts/build.sh
+++ b/.gitea/scripts/build.sh
@@ -1,30 +1,34 @@
 #!/usr/bin/env bash
 set -euo pipefail
-echo "=== GITHUB_* Variables ==="
-printenv | grep '^GITHUB_'
-echo
-echo "=== GITEA_* Variables ==="
-printenv | grep '^GITEA_'
 
 mkdir -p app/static
 
 cp CHANGELOG.md app/static/CHANGELOG.md
 
+# Derive branch/tag info
+REF_TYPE="${GITHUB_REF_TYPE:-branch}"
+REF_NAME="${GITHUB_REF_NAME:-$(basename "$GITHUB_REF")}"
+BRANCH="${GITHUB_HEAD_REF:-}"
+BASE_BRANCH="${GITHUB_BASE_REF:-}"
+if [[ -z "$BRANCH" && "$REF_TYPE" == "branch" ]]; then
+  BRANCH="$REF_NAME"
+fi
+
 cat >app/static/git.json <<EOF
 {
-  "ref": "${GITEA_REF:-}",
-  "ref_name": "${GITEA_REF_NAME:-}",
-  "ref_type": "${GITEA_REF_TYPE:-}",
-  "sha": "${GITEA_SHA:-}",
-  "run_number": "${GITEA_RUN_NUMBER:-}",
-  "server_url": "${GITEA_SERVER_URL:-}",
-  "event_name": "${GITEA_EVENT_NAME:-}",
-  "workflow": "${GITEA_WORKFLOW:-}",
-  "job": "${GITEA_JOB:-}",
-  "commit_message": "${GITEA_COMMIT_MESSAGE:-}",
-  "commit_timestamp": "${GITEA_COMMIT_TIMESTAMP:-}",
-  "branch": "${GITEA_HEAD_REF:-}",
-  "base_branch": "${GITEA_BASE_REF:-}"
+  "ref": "${GITHUB_REF:-}",
+  "ref_name": "${REF_NAME}",
+  "ref_type": "${REF_TYPE}",
+  "sha": "${GITHUB_SHA:-}",
+  "run_number": "${GITHUB_RUN_NUMBER:-}",
+  "server_url": "${GITHUB_SERVER_URL:-}",
+  "event_name": "${GITHUB_EVENT_NAME:-}",
+  "workflow": "${GITHUB_WORKFLOW:-}",
+  "job": "${GITHUB_JOB:-}",
+  "commit_message": "$(git log -1 --pretty=%B)",
+  "commit_timestamp": "$(git log -1 --pretty=%cI)",
+  "branch": "${BRANCH}",
+  "base_branch": "${BASE_BRANCH}"
 }
 EOF