chore(fdroid): finalize recipe at v2.7.3 + reproducible-release CI guard

v2.7.3 is the first release built with `vcsInfo { include = false }` and is
verified reproducible: a clean from-source build matched the published
calendula_v2.7.3.apk byte-for-byte across all 1382 zip entries (only the
signature block differs, which F-Droid copies).

- Point the fdroiddata recipe's Builds entry + CurrentVersion at v2.7.3
  (was the 2.7.2 placeholder, which lacks the fix and would fail verification).
- UpdateCheckMode: Tags ^v[0-9.]+$ — after this one-time submission F-Droid
  auto-tracks new release tags and adds build entries itself; no manual recipe
  edits per release.
- Add scripts/check_reproducible_release.sh + an always-on CI step asserting the
  release build keeps VCS-info disabled, so reproducibility can't silently
  regress and quietly stop official-repo publishing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -30,6 +30,12 @@ jobs:
           # Full history so the base..HEAD diff below has a merge-base.
           fetch-depth: 0
 
+      # Cheap, always-on guard: the release build must stay reproducible for the
+      # official F-Droid repo (no AGP VCS-info embedding). Runs regardless of
+      # change scope so a regression can't slip through on a "docs-only" PR.
+      - name: Reproducible-release invariant
+        run: bash scripts/check_reproducible_release.sh
+
       # Decide whether anything that affects the app build changed. Docs,
       # F-Droid metadata and the licence don't, so those PRs skip the SDK +
       # Gradle work below but still report a green `ci`.

docs/fdroid-official/de.jeanlucmakiola.calendula.yml

@@ -27,16 +27,16 @@ AutoName: Calendula
 RepoType: git
 Repo: https://gitea.jeanlucmakiola.de/makiolaj/calendula.git
 
-# IMPORTANT: the first build entry MUST target the first release that contains
-# `vcsInfo { include = false }` (added on branch chore/release-verification-process).
-# v2.7.1 and earlier embed META-INF/version-control-info.textproto, whose
-# env-dependent git metadata breaks reproducibility — they will NOT verify.
-# Update the versionName/versionCode/commit/Binaries below once that release is
-# tagged (e.g. v2.7.2 -> versionCode 20702). Values below are placeholders.
+# First build entry = v2.7.3, the first release with `vcsInfo { include = false }`.
+# VERIFIED reproducible (2026-06-21): a clean from-source build of tag v2.7.3
+# matched the published calendula_v2.7.3.apk byte-for-byte across all 1382 zip
+# entries (only the signature block differs, which F-Droid copies). v2.7.2 and
+# earlier embed META-INF/version-control-info.textproto and will NOT verify — do
+# not target them. Subsequent versions are added automatically (AutoUpdateMode).
 Builds:
-  - versionName: 2.7.2
-    versionCode: 20702
-    commit: v2.7.2
+  - versionName: 2.7.3
+    versionCode: 20703
+    commit: v2.7.3
     subdir: app
     gradle:
       - yes
@@ -49,10 +49,13 @@ Builds:
 AllowedAPKSigningKeys: 5cdaee8eb31cb0df9157c646ae3ec8b3dc43b5bb72624e088c9ddea0c4eb5ec1
 
 # Our own developer-signed APK for reproducible-build verification. %v -> the
-# versionName, so v2.7.2 resolves to calendula_v2.7.2.apk on the self-hosted repo.
+# versionName, so v2.7.3 resolves to calendula_v2.7.3.apk on the self-hosted repo.
 Binaries: https://apps.dev.jeanlucmakiola.de/dev/fdroid/repo/calendula_v%v.apk
 
+# After this one-time submission F-Droid auto-tracks new vX.Y.Z tags and creates
+# build entries itself — no manual recipe edits per release. The tag regex keeps
+# it to release tags only.
 AutoUpdateMode: Version v%v
-UpdateCheckMode: Tags
-CurrentVersion: 2.7.2
-CurrentVersionCode: 20702
+UpdateCheckMode: Tags ^v[0-9.]+$
+CurrentVersion: 2.7.3
+CurrentVersionCode: 20703

scripts/check_reproducible_release.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Reproducibility guard for the official F-Droid repo.
+#
+# F-Droid only republishes OUR signed binary if a from-source build reproduces
+# it byte-for-byte. AGP's VCS-info injection writes
+# META-INF/version-control-info.textproto with build-environment git metadata
+# (commit hash / path) — env-dependent, and the one thing that broke
+# reproducibility before we disabled it. It MUST stay off on the release build,
+# or new versions silently stop publishing to the official repo (fails safe, but
+# you'd be stuck on an old version without noticing). Fail loudly if it regresses.
+set -euo pipefail
+F="app/build.gradle.kts"
+
+# Match `vcsInfo { ... include = false ... }` within the block, tolerant of
+# whitespace/newlines (-z: whole file as one record; [^}] stays inside the block).
+if grep -Pzoq 'vcsInfo\s*\{[^}]*include\s*=\s*false' "$F"; then
+  echo "OK: release build disables AGP VCS-info — stays reproducible for F-Droid."
+else
+  echo "ERROR: '$F' release build is missing 'vcsInfo { include = false }'." >&2
+  echo "AGP would embed env-dependent git metadata (version-control-info.textproto)," >&2
+  echo "breaking F-Droid reproducible builds. Restore it. See docs/fdroid-official/." >&2
+  exit 1
+fi