add cross-maia-sdr docker image

This image is needed to build a new version of maia-httpd that
depends on pm-remez.

Signed-off-by: Daniel Estévez <[email protected]>

.github/workflows/cross-maia-sdr.yml

@@ -0,0 +1,46 @@
+name: Build and publish cross-maia-sdr Docker image
+
+on:
+  push:
+    branches: ['test-cross-maia-sdr']
+    tags:
+      - cross-maia-sdr-**
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: cross-armv7-unknown-linux-gnueabihf-maia-sdr
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=match,pattern=cross-maia-sdr-(\d+),group=1
+            type=ref,event=branch
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ env.IMAGE_NAME }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -55,6 +55,16 @@ docker exec -u 0 -it maia-sdr-devel /bin/bash
 From this session, it is possible to run the Vivado installer and choose
 `/opt/Xilinx` as the installation path.
 
+## cross-armv7-unknown-linux-gnueabihf-maia-sdr
+
+[ghcr.io/maia-sdr/cross-armv7-unknown-linux-gnueabihf-maia-sdr](https://github.com/orgs/maia-sdr/packages/container/package/cross-armv7-unknown-linux-gnueabihf-maia-sdr)
+can be used to build
+[maia-httpd](https://github.com/maia-sdr/maia-sdr/tree/main/maia-httpd) with
+[cross](https://github.com/cross-rs/cross). In addition to the usual cross
+stable Docker image, it contains some packages required to build
+[pm-remez](https://github.com/maia-sdr/pm-remez), including the Fortran
+cross-compiler.
+
 ## cross-armv7-buildroot-linux-uclibc-gnueabihf
 
 [ghcr.io/maia-sdr/cross-armv7-buildroot-linux-uclibc-gnueabihf](https://github.com/orgs/maia-sdr/packages/container/package/cross-armv7-buildroot-linux-uclibc-gnueabihf) is used to build

cross-armv7-unknown-linux-gnueabihf-maia-sdr/Dockerfile

@@ -0,0 +1,14 @@
+FROM ghcr.io/cross-rs/armv7-unknown-linux-gnueabihf:0.2.5
+ARG DEBIAN_FRONTEND=noninteractive
+
+# Set up env variables to cross-compile openblas and install packages required
+# to build pm-remez
+
+ENV OPENBLAS_TARGET=armv7
+ENV OPENBLAS_HOSTCC=gcc
+ENV OPENBLAS_CC=arm-linux-gnueabihf-gcc
+ENV OPENBLAS_FC=arm-linux-gnueabihf-gfortran
+
+RUN apt-get update && \
+    apt-get -y install pkg-config libssl-dev gfortran-arm-linux-gnueabihf && \
+    rm -rf /var/lib/apt/lists/*