Add support for GitHub codespaces

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

.devcontainer/Dockerfile

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+FROM ubuntu:focal
+
+ARG DEBIAN_FRONTEND=noninteractive
+ENV ANDROID_HOME=/usr/lib/android-sdk
+
+RUN apt-get update -y
+RUN apt-get install -y unzip wget openjdk-8-jdk vim
+
+RUN wget https://dl.google.com/android/repository/commandlinetools-linux-6858069_latest.zip -O /tmp/commandlinetools.zip
+RUN cd /tmp && unzip commandlinetools.zip
+RUN mkdir -p /usr/lib/android-sdk/cmdline-tools/
+RUN cd /tmp/ && mv cmdline-tools/ latest/ && mv latest/ /usr/lib/android-sdk/cmdline-tools/
+RUN mkdir /usr/lib/android-sdk/licenses/
+RUN chmod -R 755 /usr/lib/android-sdk/
+RUN mkdir -p $HOME/.gradle
+RUN echo "org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError" > $HOME/.gradle/gradle.properties

.devcontainer/README.md

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+# Instructions
+
+1. Start a DevContainer either on GitHub Codespaces or locally in VSCode
+2. Accept all licenses by running `yes | /usr/lib/android-sdk/cmdline-tools/latest/bin/sdkmanager --licenses`
+3. You can now build the app using `./gradlew clean build`

.devcontainer/devcontainer.env

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+ANDROID_HOME=/usr/lib/android-sdk
+JAVA_OPTS="-Xmx8192M"
+GRADLE_OPTS="-Dorg.gradle.daemon=true"

.devcontainer/devcontainer.json

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+{
+	"name": "NextcloudTalkAndroid",
+	"dockerFile": "Dockerfile",
+}