Add Dockerfile for local F-Droid builds

ci/containers/README.md

@@ -10,4 +10,10 @@ You're going to have to do this as root unless you have rootless containers set
 * remove the container:
   ```podman rm linux-build```
 * remove the image:
-  ```podman image rm linux-build:latest```
+  ```podman image rm linux-build:latest```
+
+## F-Droid container
+* building the image
+  ``` podman build -t fdroid --network=host -f ci/containers/fdroid-build.dockerfile```
+* run a build against the latest metadata version (run in fdroiddata repo)
+  ``` podman run --rm -v $(pwd):/repo -v /opt/android-sdk-linux:/opt/android-sdk -e ANDROID_HOME:/opt/android-sdk fdroid```

ci/containers/fdroid-build.dockerfile

@@ -0,0 +1,5 @@
+FROM registry.gitlab.com/fdroid/docker-executable-fdroidserver:master
+
+COPY fdroid-build.sh /
+
+ENTRYPOINT ["bash", "/fdroid-build.sh"]

ci/containers/fdroid-build.sh

@@ -0,0 +1,31 @@
+#!/bin/env bash
+
+set -x;
+
+echo "Building latest de.tutao.tutanota"
+VERCODE=$(grep CurrentVersionCode metadata/de.tutao.tutanota.yml |  awk '{print $2}')
+echo "Version: $VERCODE"
+
+# get all those good env vars that we need (like $fdroidserver and $home_vagrant)
+source /etc/profile.d/bsenv.sh;
+
+# PYTHONPATH is needed to find the plugins, we need fetchsrclibs.
+export fdroid="sudo --preserve-env --user vagrant
+    env PATH=$fdroidserver:$PATH
+    env PYTHONPATH=$fdroidserver:$fdroidserver/examples
+    env PYTHONUNBUFFERED=true
+    env TERM=$TERM
+    env HOME=$home_vagrant
+    fdroid";
+
+# We move the data we need into vagrant home. There are some guards against just running in the data repo.
+ln -s $PWD/srclibs/ $home_vagrant/srclibs;
+mkdir $home_vagrant/metadata;
+cp metadata/de.tutao.tutanota.yml $home_vagrant/metadata/;
+
+# Start the build in home dir.
+cd $home_vagrant;
+# This will fetch rustup for us but not actually install anything.
+$fdroid fetchsrclibs de.tutao.tutanota:$VERCODE --verbose;
+# Run the actual build.
+$fdroid build --verbose --test --on-server --no-tarball de.tutao.tutanota:$VERCODE;