Add Alpine 3.21 helix images

src/alpine/3.21/helix/Dockerfile

@@ -0,0 +1,60 @@
+FROM library/alpine:3.21 AS venv
+
+RUN apk add --upgrade --no-cache \
+        cargo \
+        python3-dev \
+        build-base \
+        libffi-dev \
+        openssl-dev \
+        gcc \
+        linux-headers
+
+RUN python3 -m venv /venv && \
+        source /venv/bin/activate && \
+        pip download --no-deps helix-scripts --index-url https://dnceng.pkgs.visualstudio.com/public/_packaging/helix-client-prod/pypi/simple && \
+        pip install ./helix_scripts-*-py3-none-any.whl
+
+FROM library/alpine:3.21
+
+# Install .NET and test dependencies
+RUN apk add --upgrade --no-cache \
+        bash \
+        coreutils \
+        curl \
+        icu-data-full \
+        icu-libs \
+        iputils \
+        krb5-libs \
+        lldb \
+        llvm \
+        lttng-ust \
+        musl-locales \
+        numactl \
+        openssl \
+        python3 \
+        python3-dev \
+        py3-pip \
+        sudo \
+        tzdata
+
+# Install libmsquic from testing repository
+RUN apk add --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community/ libmsquic
+
+# Needed for runtime tests to pass
+ENV LANG=en-US.UTF-8
+RUN echo export LANG=${LANG}  >> /etc/profile.d/locale.sh
+
+# create helixbot user and give rights to sudo without password
+# Alpine does not support long options
+RUN /usr/sbin/adduser -D -g '' -G adm -s /bin/bash -u 1000 helixbot && \
+    chmod 755 /root && \
+    echo "helixbot ALL=(ALL)       NOPASSWD: ALL" > /etc/sudoers.d/helixbot
+
+USER helixbot
+
+# Install Helix Dependencies
+
+ENV VIRTUAL_ENV=/home/helixbot/.vsts-env
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+COPY --from=venv /venv $VIRTUAL_ENV

src/alpine/manifest.json

@@ -216,6 +216,47 @@
               }
             }
           ]
+        },
+        {
+          "platforms": [
+            {
+              "architecture": "amd64",
+              "dockerfile": "src/alpine/3.21/helix",
+              "os": "linux",
+              "osVersion": "alpine3.21",
+              "tags": {
+                "alpine-3.21-helix-amd64": {}
+              }
+            }
+          ]
+        },
+        {
+          "platforms": [
+            {
+              "architecture": "arm",
+              "dockerfile": "src/alpine/3.21/helix",
+              "os": "linux",
+              "osVersion": "alpine3.21",
+              "tags": {
+                "alpine-3.21-helix-arm32v7": {}
+              },
+              "variant": "v7"
+            }
+          ]
+        },
+        {
+          "platforms": [
+            {
+              "architecture": "arm64",
+              "dockerfile": "src/alpine/3.21/helix",
+              "os": "linux",
+              "osVersion": "alpine3.21",
+              "tags": {
+                "alpine-3.21-helix-arm64v8": {}
+              },
+              "variant": "v8"
+            }
+          ]
         }
       ]
     }