Add Alpine 3.21 Dockerfile (#1284)

src/alpine/3.21/amd64/Dockerfile

@@ -0,0 +1,72 @@
+FROM amd64/alpine:3.21
+
+# Install .NET and test dependencies
+RUN apk add --upgrade --no-cache \
+        autoconf \
+        automake \
+        bash \
+        build-base \
+        brotli-dev \
+        ca-certificates \
+        clang \
+        clang-dev \
+        cmake \
+        coreutils \
+        cpio \
+        curl \
+        elfutils \
+        file \
+        gcc \
+        gettext-dev \
+        git \
+        icu-data-full \
+        icu-dev \
+        icu-libs \
+        iproute2 \
+        jq \
+        krb5-dev \
+        less \
+        libgcc \
+        libintl \
+        libssl3 \
+        libstdc++ \
+        libtool \
+        libunwind-dev \
+        linux-headers \
+        lld \
+        lldb-dev \
+        llvm \
+        lttng-ust-dev \
+        ncurses-terminfo-base \
+        make \
+        numactl-dev \
+        openssl \
+        openssl-dev \
+        paxctl \
+        pigz \
+        py3-lldb \
+        python3-dev \
+        shadow \
+        sudo \
+        tzdata \
+        userspace-rcu \
+        util-linux-dev \
+        which \
+        zlib-dev
+
+# Install the latest non-preview powershell release.
+RUN apk -X https://dl-cdn.alpinelinux.org/alpine/edge/main add --no-cache lttng-ust \
+    && LATEST_TAG=$(curl -L https://api.github.com/repos/powershell/powershell/releases/latest | jq -r '.tag_name') \
+    && curl -L https://github.com/PowerShell/PowerShell/releases/download/$LATEST_TAG/powershell-${LATEST_TAG#*v}-linux-musl-x64.tar.gz -o /tmp/powershell.tar.gz \
+    && mkdir -p /opt/microsoft/powershell \
+    && tar zxf /tmp/powershell.tar.gz -C /opt/microsoft/powershell \
+    && chmod +x /opt/microsoft/powershell/pwsh \
+    && ln -s /opt/microsoft/powershell/pwsh /usr/bin/pwsh \
+    && rm -f /tmp/powershell.tar.gz
+
+# Install azurecli from PIP
+RUN azureEnv="/usr/local/share/azure-cli-env" \
+    && python3 -m venv "$azureEnv" \
+    && "$azureEnv/bin/python" -m pip install --upgrade setuptools \
+    && "$azureEnv/bin/python" -m pip install azure-cli \
+    && ln -s "$azureEnv/bin/az" /usr/local/bin/az

src/alpine/manifest.json

@@ -244,6 +244,18 @@
             }
           ]
         },
+        {
+          "platforms": [
+            {
+              "dockerfile": "src/alpine/3.21/amd64",
+              "os": "linux",
+              "osVersion": "alpine3.21",
+              "tags": {
+                "alpine-3.21-amd64": {}
+              }
+            }
+          ]
+        },
         {
           "platforms": [
             {