[3/4] ci: add tests for sqlite3

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 04c67cb..9edec88 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -24,7 +24,7 @@  jobs:
     strategy:
       matrix:
         python: [3.6, 3.7, 3.8, 3.9]
-        db: [postgres, mysql]
+        db: [postgres, mysql, sqlite3]
     env:
       DATABASE_NAME: patchwork
       DATABASE_USER: patchwork
@@ -88,7 +88,8 @@  jobs:
         run: tox
         env:
           DATABASE_TYPE: "${{ matrix.db }}"
-          DATABASE_HOST: "127.0.0.1"
+          DATABASE_HOST: ${{ matrix.db != 'sqlite3' && '127.0.0.1' || '' }}
+          DATABASE_NAME: ${{ matrix.db != 'sqlite3' && env.DATABASE_NAME || '/dev/shm/patchwork.test.db.sqlite3' }}
   docs:
     name: Build docs
     runs-on: ubuntu-latest
@@ -116,7 +117,7 @@  jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        db: [postgres, mysql]
+        db: [postgres, mysql, sqlite3]
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
@@ -128,7 +129,7 @@  jobs:
           python-version: 3.9
       - name: Bring up docker-compose service
         env:
-          COMPOSE_FILE: ${{ matrix.db == 'mysql' && 'docker-compose.yml' || 'docker-compose-pg.yml' }}
+          COMPOSE_FILE: ${{ matrix.db == 'mysql' && 'docker-compose.yml' || (matrix.db == 'postgres' && 'docker-compose-pg.yml') || 'docker-compose-sqlite3.yml' }}
         run: |
           docker-compose build --build-arg UID=$(id -u) --build-arg GID=$(id -g)
           docker-compose up --detach
diff --git a/docker-compose-sqlite3.yml b/docker-compose-sqlite3.yml
new file mode 100644
index 0000000..d4c6659
--- /dev/null
+++ b/docker-compose-sqlite3.yml
@@ -0,0 +1,19 @@ 
+version: "3"
+services:
+  web:
+    build:
+      context: .
+      dockerfile: ./tools/docker/Dockerfile
+      args:
+        - UID
+        - GID
+    command: python3 manage.py runserver 0.0.0.0:8000
+    volumes:
+      - .:/home/patchwork/patchwork/
+    ports:
+      - "8000:8000"
+    environment:
+      - UID
+      - GID
+      - DATABASE_TYPE=sqlite3
+      - DATABASE_NAME=/home/patchwork/patchwork/tools/docker/db/db.sqlite3
diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index fe0cd59..18f1e4c 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -38,6 +38,7 @@  RUN apt-get update && apt-get install -y --no-install-recommends \
     libssl-dev \
     mysql-client \
     postgresql-client \
+    sqlite3 \
     tzdata \
     zlib1g-dev \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
diff --git a/tools/docker/entrypoint.sh b/tools/docker/entrypoint.sh
index 6be90b9..343f644 100755
--- a/tools/docker/entrypoint.sh
+++ b/tools/docker/entrypoint.sh
@@ -3,18 +3,22 @@  set -euo pipefail
 
 export DATABASE_HOST=${DATABASE_HOST:-}
 export DATABASE_PORT=${DATABASE_PORT:-}
-export DATABASE_NAME=${DATABASE_NAME:-patchwork}
 export DATABASE_USER=${DATABASE_USER:-patchwork}
 export DATABASE_PASS=${DATABASE_PASS:-password}
 
 case "${DATABASE_TYPE:-}" in
 postgres)
+    export DATABASE_NAME=${DATABASE_NAME:-patchwork}
     export PGPORT=${DATABASE_PORT}
     export PGPASSWORD=${DATABASE_PASS}
     psql_args=( ${DATABASE_HOST:+--host=${DATABASE_HOST}} "--username=${DATABASE_USER}" )
     ;;
+sqlite3)
+    export DATABASE_NAME=${DATABASE_NAME:-}
+    ;;
 *)
     export DATABASE_TYPE=mysql
+    export DATABASE_NAME=${DATABASE_NAME:-patchwork}
     mysql_args=( ${DATABASE_HOST:+--host=${DATABASE_HOST}} ${DATABASE_PORT:+--port=${DATABASE_PORT}} "--user=${DATABASE_USER}" "--password=${DATABASE_PASS}" )
     mysql_root_args=( ${DATABASE_HOST:+--host=${DATABASE_HOST}} ${DATABASE_PORT:+--port=${DATABASE_PORT}} "--user=root" "--password=${MYSQL_ROOT_PASSWORD:-}" )
     ;;
@@ -23,19 +27,25 @@  esac
 # functions
 
 test_db_connection() {
-    if [ ${DATABASE_TYPE} = "postgres" ]; then
-        echo ';' | psql "${psql_args[@]}" 2> /dev/null > /dev/null
-    else
-        mysqladmin "${mysql_root_args[@]}" ping > /dev/null 2> /dev/null
-    fi
+    case "${DATABASE_TYPE}" in
+    "postgres")
+        echo ';' | psql "${psql_args[@]}" 2> /dev/null > /dev/null ;;
+    "mysql")
+        mysqladmin "${mysql_root_args[@]}" ping > /dev/null 2> /dev/null ;;
+    "sqlite3")
+        echo ';' | sqlite3 "${DATABASE_NAME}" > /dev/null 2> /dev/null ;;
+    esac
 }
 
 test_database() {
-    if [ ${DATABASE_TYPE} = "postgres" ]; then
-        echo 'DESCRIBE patchwork_project;' | psql "${psql_args[@]}" "${DATABASE_NAME}" 2> /dev/null
-    else
-        echo 'DESCRIBE patchwork_project;' | mysql "${mysql_args[@]}" "${DATABASE_NAME}" 2> /dev/null
-    fi
+    case "${DATABASE_TYPE}" in
+    "postgres")
+        echo 'DESCRIBE patchwork_project;' | psql "${psql_args[@]}" "${DATABASE_NAME}" 2> /dev/null ;;
+    "mysql")
+        echo 'DESCRIBE patchwork_project;' | mysql "${mysql_args[@]}" "${DATABASE_NAME}" 2> /dev/null ;;
+    "sqlite3")
+        echo 'SELECT 0 FROM patchwork_project;' | sqlite3 "${DATABASE_NAME}" > /dev/null 2> /dev/null ;;
+    esac
 }
 
 reset_data_mysql() {
@@ -55,12 +65,19 @@  CREATE DATABASE ${DATABASE_NAME} WITH ENCODING = 'UTF8';
 EOF
 }
 
+reset_data_sqlite3() {
+    rm -f "${DATABASE_NAME}"
+}
+
 reset_data() {
-    if [ x${DATABASE_TYPE} = x"postgres" ]; then
-        reset_data_postgres
-    else
-        reset_data_mysql
-    fi
+    case "${DATABASE_TYPE}" in
+    "postgres")
+        reset_data_postgres ;;
+    "mysql")
+        reset_data_mysql ;;
+    "sqlite3")
+        reset_data_sqlite3 ;;
+    esac
 
     # load initial data
     python manage.py migrate #> /dev/null