update direnv setup

ctx/home/.config/direnv/lib/export-secret.sh

@@ -0,0 +1,16 @@
+# Exports a Podman / Docker secret as an environment variable
+export-secret() {
+    local name="$1"
+    local file="/run/secrets/${name}"
+
+    if [[ ! -f "$file" ]]; then
+        printf "secret file not found: %s\n" $file >&2
+        return 1
+    fi
+
+    # Read first line, remove trailing spaces/tabs, convert nulls to newlines
+    local value
+    value=$(head -n1 "$file" | sed 's/[ \t]*$//' | tr '\0' '\n')
+
+    export "${name}=${value}"
+}