lots of changes:

- added man command
- added unit tests
- fixed import+export file parameters (now -o and -r respectively)
- added README + License
- added ci pipelines

.github/workflows/pushimage.yaml

@@ -0,0 +1,34 @@
+name: build-push-image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567
+        with:
+          registry: https://ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355
+        with:
+          push: true
+          tags: ghcr.io/tlinden/anydb:${{ github.ref_name}}
+
+      - name: Build and push latest Docker image
+        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355
+        with:
+          push: true
+          tags: ghcr.io/tlinden/anydb:latest