style: Address warnings in Dockerfiles and GHA workflows

.github/workflows/deploy-master.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119
@@ -77,7 +77,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119
@@ -125,7 +125,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119

.github/workflows/release.yml

@@ -97,7 +97,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get tag name
-        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "::set-output name=tag::${tag#v}"
+        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "tag=${tag#v}" >> $GITHUB_OUTPUT
         id: tag
       - name: Check out the repo
         uses: actions/checkout@v4
@@ -118,7 +118,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119
@@ -148,7 +148,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get tag name
-        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "::set-output name=tag::${tag#v}"
+        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "tag=${tag#v}" >> $GITHUB_OUTPUT
         id: tag
       - name: Check out the repo
         uses: actions/checkout@v4
@@ -169,7 +169,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119
@@ -203,7 +203,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get tag name
-        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "::set-output name=tag::${tag#v}"
+        run: tag="${{ needs.release-please.outputs.tag_name }}"; echo "tag=${tag#v}" >> $GITHUB_OUTPUT
         id: tag
       - name: Check out the repo
         uses: actions/checkout@v4
@@ -224,7 +224,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          echo "::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+          echo "created=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
       - name: Push to Docker Hub
         # cf. https://github.com/docker/build-push-action#customizing
         # and https://github.com/docker/build-push-action/pull/119

Dockerfile

@@ -1,12 +1,12 @@
-FROM ocaml/opam:alpine-3.20-ocaml-5.1 as compilation
+FROM ocaml/opam:alpine-3.20-ocaml-5.1 AS compilation
 LABEL Description="learn-ocaml building" Vendor="OCamlPro"
 
 WORKDIR /home/opam/learn-ocaml
 
 COPY learn-ocaml.opam learn-ocaml.opam.locked learn-ocaml-client.opam learn-ocaml-client.opam.locked ./
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMYES true
+ENV OPAMYES=true
 RUN echo 'archive-mirrors: [ "https://opam.ocaml.org/cache" ]' >> ~/.opam/config \
   && opam repository set-url default http://opam.ocaml.org \
   && opam switch 5.1 \
@@ -23,12 +23,12 @@ COPY dune-project dune-project
 COPY dune dune
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMVERBOSE 1
+ENV OPAMVERBOSE=1
 RUN cat /proc/cpuinfo /proc/meminfo
 RUN opam install . --destdir /home/opam/install-prefix --locked
 
 
-FROM alpine:3.20 as client
+FROM alpine:3.20 AS client
 
 RUN apk update \
   && apk add ncurses-libs libev dumb-init libssl3 libcrypto3 \
@@ -45,7 +45,7 @@ COPY --from=compilation /home/opam/install-prefix/bin/learn-ocaml-client /usr/bi
 ENTRYPOINT ["dumb-init","/usr/bin/learn-ocaml-client"]
 
 
-FROM alpine:3.20 as program
+FROM alpine:3.20 AS program
 
 RUN apk update \
   && apk add ncurses-libs libev dumb-init git openssl lsof \

Dockerfile.test-client

@@ -1,7 +1,7 @@
 # This Dockerfile is useful for testing purposes
 # to ensure learn-ocaml-client can be built alone from learn-ocaml-client.opam
 
-FROM ocaml/opam:alpine-3.20-ocaml-5.1 as compilation
+FROM ocaml/opam:alpine-3.20-ocaml-5.1 AS compilation
 LABEL Description="learn-ocaml building" Vendor="OCamlPro"
 
 WORKDIR /home/opam/learn-ocaml
@@ -10,7 +10,7 @@ WORKDIR /home/opam/learn-ocaml
 COPY learn-ocaml-client.opam learn-ocaml.opam ./
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMYES true
+ENV OPAMYES=true
 RUN echo 'archive-mirrors: [ "https://opam.ocaml.org/cache" ]' >> ~/.opam/config \
   && opam repository set-url default http://opam.ocaml.org \
   && opam switch 5.1 \
@@ -28,13 +28,13 @@ COPY dune-project dune-project
 COPY dune dune
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMVERBOSE 1
+ENV OPAMVERBOSE=1
 
 RUN opam install learn-ocaml-client --destdir /home/opam/install-prefix \
   && ls -l /home/opam/install-prefix/bin/learn-ocaml-client
 
 
-FROM alpine:3.20 as client
+FROM alpine:3.20 AS client
 
 ARG BUILD_DATE
 ARG VCS_BRANCH

Dockerfile.test-server

@@ -1,7 +1,7 @@
 # This Dockerfile is useful for testing purposes
 # to ensure learn-ocaml can be built alone from learn-ocaml.opam
 
-FROM ocaml/opam:alpine-3.20-ocaml-5.1 as compilation
+FROM ocaml/opam:alpine-3.20-ocaml-5.1 AS compilation
 LABEL Description="learn-ocaml building" Vendor="OCamlPro"
 
 WORKDIR /home/opam/learn-ocaml
@@ -10,7 +10,7 @@ WORKDIR /home/opam/learn-ocaml
 COPY learn-ocaml.opam learn-ocaml-client.opam ./
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMYES true
+ENV OPAMYES=true
 RUN echo 'archive-mirrors: [ "https://opam.ocaml.org/cache" ]' >> ~/.opam/config \
   && opam repository set-url default http://opam.ocaml.org \
   && opam switch 5.1 \
@@ -28,16 +28,16 @@ COPY dune-project dune-project
 COPY dune dune
 RUN sudo chown -R opam:nogroup .
 
-ENV OPAMVERBOSE 1
+ENV OPAMVERBOSE=1
 
 # Run "make detect-libs"
-ENV OPAMWITHTEST 1
+ENV OPAMWITHTEST=1
 
 RUN opam install learn-ocaml --destdir /home/opam/install-prefix \
   && ls -l /home/opam/install-prefix/bin/learn-ocaml
 
 
-FROM alpine:3.20 as program
+FROM alpine:3.20 AS program
 
 ARG BUILD_DATE
 ARG VCS_BRANCH

ci/docker-emacs-learn-ocaml-client/Dockerfile

@@ -14,11 +14,11 @@ RUN apk add --no-cache \
   && mkdir -p -v bin \
   && chown -v learn-ocaml:learn-ocaml bin
 
-ENV PATH /home/learn-ocaml/bin:${PATH}
+ENV PATH="/home/learn-ocaml/bin:${PATH}"
 
-ENV LANG C.UTF-8
-# ENV LC_ALL C.UTF-8
-# ENV LANGUAGE en_US:en
+ENV LANG="C.UTF-8"
+# ENV LC_ALL="C.UTF-8"
+# ENV LANGUAGE="en_US:en"
 
 COPY --chown=learn-ocaml:learn-ocaml .emacs .emacs