diff --git a/.github/workflows/daily-jobs.yml b/.github/workflows/daily-jobs.yml
index 70050d7..2dd6215 100644
--- a/.github/workflows/daily-jobs.yml
+++ b/.github/workflows/daily-jobs.yml
@@ -15,7 +15,7 @@ jobs:
 
       matrix:
         branch:
-          - sid_amd64
+          - debian_unstable
           - fedora38_x86_64
           - fedora_rawhide_x86_64
 
@@ -23,7 +23,7 @@ jobs:
       SLUG: "collectd/ci:${{ matrix.branch }}"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ matrix.branch }}
     - name: Build container
@@ -32,7 +32,7 @@ jobs:
     - run: docker inspect "${SLUG}"
     - run: docker history "${SLUG}"
     - name: Log into the container registry
-      uses: docker/login-action@v1
+      uses: docker/login-action@v3
       with:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
diff --git a/.github/workflows/merge-jobs.yml b/.github/workflows/merge-jobs.yml
index 7c83809..4db6027 100644
--- a/.github/workflows/merge-jobs.yml
+++ b/.github/workflows/merge-jobs.yml
@@ -20,7 +20,7 @@ jobs:
       - run: docker history "${SLUG:?}"
       - run: docker images
       - name: Log into the container registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
diff --git a/.github/workflows/weekly-jobs.yml b/.github/workflows/weekly-jobs.yml
index 4b9f383..22195db 100644
--- a/.github/workflows/weekly-jobs.yml
+++ b/.github/workflows/weekly-jobs.yml
@@ -39,7 +39,7 @@ jobs:
       SLUG: "collectd/ci:${{ matrix.branch }}"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         ref: ${{ matrix.branch }}
     - name: Build container
@@ -48,7 +48,7 @@ jobs:
     - run: docker inspect "${SLUG}"
     - run: docker history "${SLUG}"
     - name: Log into the container registry
-      uses: docker/login-action@v1
+      uses: docker/login-action@v3
       with:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
diff --git a/README.md b/README.md
index b19c19e..d852db3 100644
--- a/README.md
+++ b/README.md
@@ -4,29 +4,29 @@ Helper images for building collectd
 Here is a collection of manifests used to build the Docker images hosted at:
 <https://cloud.docker.com/u/collectd/repository/docker/collectd/ci/tags>
 
-There is one branch per distribution/architecture pair which collectd is tested
-against. Common bits are stored in the master branch, and merged into the
-distro branches when needed.
+There is one branch per distribution/version against which collectd is tested.
+Common bits, most notably GitHub Actions, are stored in the main branch, and
+merged into the distro branches when needed.
 
 Each Dockerfile contains a list of package names (mostly support libraries) to
-install, and a list of plugins collectd *master* is expected to build based on
+install, and a list of plugins collectd *main* is expected to build based on
 them. We want to stick to the official repositories, and only install packages
 found there, to ensure collectd releases integrate smoothly in these
 distributions.
 
-Travis-CI takes care of building these images and pushing them to
-cloud.docker.com. NB: Debian/sid and Fedora/rawhide built are triggered once
-per day (as these distributions change constantly). You'll find the build logs
-there: <https://travis-ci.org/collectd/ci-docker/builds>
+GitHub Actions take care of building these images and pushing them to
+`cloud.docker.com`.
+
+NOTE: Debian unstable ("Sid") and Fedora unstable ("Rawhide") are rebuilt daily
+(as these distributions change frequently).
 
 The goal is to have the resulting images fit in the collectd project's CI, but
-they are free to use for any other case. Only patches related to the CI will be
-considered, though.
+they are free to use for any other case.
 
-Here's an example of how you could build collectd in an Ubuntu/Xenial
-environment:
-```
+Here's an example of how you can build collectd on Debian unstable:
+
+```shell
 git clone https://github.com/collectd/collectd
-docker run -it --rm -v $PWD/collectd:/collectd -w /collectd collectd/ci:xenial_amd64
-./build.sh && ./configure && make && make check
+docker run -it --rm -v $PWD/collectd:/collectd -w /collectd collectd/ci:debian_unstable
+./build.sh && ./configure && make all check
 ```
diff --git a/checks/check-built-plugins.sh b/checks/check-built-plugins.sh
index 147050d..a0721b1 100755
--- a/checks/check-built-plugins.sh
+++ b/checks/check-built-plugins.sh
@@ -3,9 +3,16 @@
 set -e
 
 declare -A want
-for p in ${SUPPORTED_PLUGIN_LIST}; do
-  want["${p}"]=1
-done
+if [[ $# -ge 1 ]]; then
+  for p in $(egrep -v '^ *($|#)' "${1}"); do
+    want["${p}"]=1
+  done
+else
+  echo "No plugins on the command line; using SUPPORTED_PLUGIN_LIST instead."
+  for p in ${SUPPORTED_PLUGIN_LIST}; do
+    want["${p}"]=1
+  done
+fi
 
 declare -A got
 for f in .libs/*.so; do