fix: disinto init: auto-generate WOODPECKER_TOKEN for repo activation (#779) (#790)

Fixes #779

## Changes
Auto-generate WOODPECKER_TOKEN during disinto init by automating the Forgejo OAuth2 login flow after the compose stack starts. Adds generate_woodpecker_token() function that: logs into Forgejo web UI, drives the OAuth2 authorize/consent flow, completes the Woodpecker callback to get a session token, then creates a persistent personal access token via Woodpecker API. Saves to .env so activate_woodpecker_repo() can use it immediately. Failures are non-fatal (guarded with || true).

Co-authored-by: openhands <openhands@all-hands.dev>
Reviewed-on: https://codeberg.org/johba/disinto/pulls/790
Reviewed-by: Disinto_bot <disinto_bot@noreply.codeberg.org>

.woodpecker/agent-smoke.sh

@@ -21,9 +21,9 @@ FAILED=0
 # Uses awk instead of grep -Eo for busybox/Alpine compatibility (#296).
 get_fns() {
   local f="$1"
-  # Use grep+sed instead of awk for BusyBox compatibility — BusyBox awk
-  # unreliably handles [(][)] bracket expressions in some Alpine builds.
-  grep -E '^[[:space:]]*[a-zA-Z_][a-zA-Z0-9_]+[[:space:]]*\(\)' "$f" 2>/dev/null \
+  # BRE mode (no -E): () is literal in BRE, avoiding BusyBox ERE bugs
+  # where \(\) is misinterpreted. BRE one-or-more via [X][X]* instead of +.
+  grep '^[[:space:]]*[a-zA-Z_][a-zA-Z0-9_][a-zA-Z0-9_]*[[:space:]]*()' "$f" 2>/dev/null \
     | sed 's/^[[:space:]]*//; s/[[:space:]]*().*$//' \
     | sort -u || true
 }