Run tests Docker in Docker (#261)

* Try running tests in Docker

* Spawn new container for each test

* Store test artifacts outside of mount

* When requested, build up to date image in test script

* sudo is unneccessary in containerized test env

* Skip azure test

* Backdate fixture file in JSON database

* Pin versions for azure tools

* Mount temp volume for /var/lib/docker to prevent dangling ones created by VOLUME instruction

* Fail backdating tests with message

* Add some documentation on test setup

* Cache images

* Run compose stacks with shortened default timeout

test/gpg/.gitignore

@@ -1 +0,0 @@
-local

test/gpg/docker-compose.yml

@@ -11,7 +11,7 @@ services:
       BACKUP_RETENTION_DAYS: ${BACKUP_RETENTION_DAYS:-7}
       GPG_PASSPHRASE: 1234#$$ecret
     volumes:
-      - ./local:/archive
+      - ${LOCAL_DIR:-./local}:/archive
       - app_data:/backup/app_data:ro
       - /var/run/docker.sock:/var/run/docker.sock
 

test/gpg/run.sh

@@ -6,7 +6,7 @@ cd "$(dirname "$0")"
 . ../util.sh
 current_test=$(basename $(pwd))
 
-mkdir -p local
+export LOCAL_DIR=$(mktemp -d)
 
 docker compose up -d --quiet-pull
 sleep 5
@@ -15,19 +15,18 @@ docker compose exec backup backup
 
 expect_running_containers "2"
 
-tmp_dir=$(mktemp -d)
+TMP_DIR=$(mktemp -d)
 
-echo "1234#\$ecret" | gpg -d --pinentry-mode loopback --yes --passphrase-fd 0 ./local/test.tar.gz.gpg > ./local/decrypted.tar.gz
-tar -xf ./local/decrypted.tar.gz -C $tmp_dir
-if [ ! -f $tmp_dir/backup/app_data/offen.db ]; then
+echo "1234#\$ecret" | gpg -d --pinentry-mode loopback --yes --passphrase-fd 0 "$LOCAL_DIR/test.tar.gz.gpg" > "$LOCAL_DIR/decrypted.tar.gz"
+tar -xf "$LOCAL_DIR/decrypted.tar.gz" -C $TMP_DIR
+
+if [ ! -f $TMP_DIR/backup/app_data/offen.db ]; then
   fail "Could not find expected file in untared archive."
 fi
-rm ./local/decrypted.tar.gz
+rm "$LOCAL_DIR/decrypted.tar.gz"
 
 pass "Found relevant files in decrypted and untared local backup."
 
-if [ ! -L ./local/test-latest.tar.gz.gpg ]; then
+if [ ! -L "$LOCAL_DIR/test-latest.tar.gz.gpg" ]; then
   fail "Could not find local symlink to latest encrypted backup."
 fi
-
-docker compose down --volumes