Add linux/arm/v7 to the list of platforms for the Docker image (#141)

Users in #99 report that Actual in Docker runs on armv7 platforms,
although a bit sluggish. I confirmed that the base images for Debian and
Alpine support the linux/arm/v7 target and have added them to the
platform list in the GitHub Actions workflow.

At least one user confirms it works with the bullseye default
`Dockerfile`, but before merging it would be great if someone can
confirm it works with the Dockerfile.alpine image:

```
git clone https://github.com/jamesmortensen/actual-server.git
cd actual-server
git checkout armv7-image
docker build -t actual-server -f Dockerfile.alpine .
docker run -p 5006:5006 actual-server
```

---------

Co-authored-by: Jed Fox <git@jedfox.com>

.github/workflows/docker-edge.yml

@@ -75,7 +75,7 @@ jobs:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           file: docker/edge-${{ matrix.os }}.Dockerfile
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ${{ steps.meta.outputs.tags }}
           build-args: |
             GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}

.github/workflows/docker-release.yml

@@ -75,7 +75,7 @@ jobs:
           context: .
           push: true
           file: docker/stable-ubuntu.Dockerfile
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ${{ steps.meta.outputs.tags }}
 
       - name: Build and push Alpine image
@@ -84,5 +84,5 @@ jobs:
           context: .
           push: true
           file: docker/stable-alpine.Dockerfile
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ${{ steps.alpine-meta.outputs.tags }}

README.md

@@ -29,6 +29,9 @@ docker build -t actual-server .
 docker run -p 5006:5006 actual-server
 ```
 
+The multi-arch Docker container image runs on amd64, arm64, and armv7 platforms. Please be warned that Actual may be sluggish on armv7, but users report that it does work.
+
+
 ## Deploying
 
 You should deploy your server so it's always running. We recommend [fly.io](https://fly.io) which makes it incredibly easy and provides a free plan.

upcoming-release-notes/141.md

@@ -0,0 +1,6 @@
+---
+category: Enhancements
+authors: [jamesmortensen]
+---
+
+Make the official Docker images available for armv7