feat: pass all NIXPACKS_ env vars

entrypoint.sh

@@ -43,6 +43,12 @@ repository_license() {
 BUILD_CMD="nixpacks build $INPUT_CONTEXT"
 GHCR_IMAGE_NAME="ghcr.io/$GITHUB_REPOSITORY"
 
+# add NIXPACKS_ prefixed environment variables to the build command
+# https://nixpacks.com/docs/configuration/environment
+for var in $(env | grep ^NIXPACKS_); do
+  BUILD_CMD="$BUILD_CMD --env $var"
+done
+
 # Incorporate provided input parameters from actions.yml into the Nixpacks build command
 if [ -n "${INPUT_TAGS}" ]; then
   read -ra TAGS <<<"$(echo "$INPUT_TAGS" | tr ',\n' ' ')"
@@ -73,6 +79,7 @@ if [ -n "$REPO_LICENSE" ]; then
 fi
 
 # TODO add the description label as well? Does this add any value?
+# TODO add org.opencontainers.image.title?
 
 for label in "${LABELS[@]}"; do
   BUILD_CMD="$BUILD_CMD --label $label"