Add POWER8+ support to our official Docker images. (#11592)

* Add POWER8+ support to our official Docker images.

* Update docs about lack of FreeIPMI in POWER8 docker images.

* Update packaging/docker/README.md

Co-authored-by: David Shreve, Jr. <david@netdata.cloud>

Co-authored-by: David Shreve, Jr. <david@netdata.cloud>

.github/workflows/docker.yml

@@ -44,6 +44,7 @@ jobs:
           - linux/i386
           - linux/arm/v7
           - linux/arm64
+          - linux/ppc64le
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -92,7 +93,7 @@ jobs:
       - name: Docker Build
         uses: docker/build-push-action@v2
         with:
-          platforms: linux/amd64,linux/i386,linux/arm/v7,linux/arm64
+          platforms: linux/amd64,linux/i386,linux/arm/v7,linux/arm64,linux/ppc64le
           push: true
           tags: ${{ env.tags }}
       - name: Failure Notification

packaging/docker/Dockerfile

@@ -99,8 +99,10 @@ RUN chown -R root:root \
     chmod 0755 /usr/libexec/netdata/plugins.d/*.plugin && \
     chmod 4755 \
         /usr/libexec/netdata/plugins.d/cgroup-network \
-        /usr/libexec/netdata/plugins.d/apps.plugin \
-        /usr/libexec/netdata/plugins.d/freeipmi.plugin && \
+        /usr/libexec/netdata/plugins.d/apps.plugin && \
+    if [ -f /usr/libexec/netdata/plugins.d/freeipmi.plugin ]; then \
+        chmod 4755 /usr/libexec/netdata/plugins.d/freeipmi.plugin; \
+    fi && \
     # Group write permissions due to: https://github.com/netdata/netdata/pull/6543
     find /var/lib/netdata /var/cache/netdata -type d -exec chmod 0770 {} \; && \
     find /var/lib/netdata /var/cache/netdata -type f -exec chmod 0660 {} \; && \

packaging/docker/README.md

@@ -32,6 +32,9 @@ directive, not a COMMAND directive. Please adapt your execution scripts accordin
 ENTRYPOINT vs COMMAND in the [Docker
 documentation](https://docs.docker.com/engine/reference/builder/#understand-how-cmd-and-entrypoint-interact).
 
+Our POWER8+ Docker images do not support our FreeIPMI collector. This is a technical limitation in FreeIPMI itself,
+and unfortunately not something we can realistically work around.
+
 ## Create a new Netdata Agent container
 
 You can create a new Agent container using either `docker run` or Docker Compose. After using either method, you can