chore(docker): Consistently upper-case the AS keyword

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

Dockerfile

@@ -22,7 +22,7 @@
 INCLUDE docker/versions.dockerfile
 
 # Use OpenJDK Eclipe Temurin Ubuntu LTS
-FROM eclipse-temurin:$JAVA_VERSION-jdk-$UBUNTU_VERSION as base
+FROM eclipse-temurin:$JAVA_VERSION-jdk-$UBUNTU_VERSION AS base
 
 ENV LANG=en_US.UTF-8
 ENV LANGUAGE=en_US:en
@@ -179,7 +179,7 @@ RUN pip install --no-cache-dir -U \
 FROM scratch AS python
 COPY --from=pythonbuild /opt/python /opt/python
 
-FROM scratch as scancode-license-data
+FROM scratch AS scancode-license-data
 COPY --from=pythonbuild /opt/scancode-license-data /opt/scancode-license-data
 
 #------------------------------------------------------------------------
@@ -409,7 +409,7 @@ COPY --from=dotnetbuild /opt/dotnet /opt/dotnet
 
 #------------------------------------------------------------------------
 # BAZEL
-FROM base as bazelbuild
+FROM base AS bazelbuild
 
 ARG BAZELISK_VERSION
 
@@ -428,13 +428,13 @@ COPY --from=gobuild /opt/go /opt/go
 
 RUN $GOBIN/go install github.com/bazelbuild/buildtools/buildozer@latest && chmod a+x $GOBIN/buildozer
 
-FROM scratch as bazel
+FROM scratch AS bazel
 COPY --from=bazelbuild /opt/bazel /opt/bazel
 COPY --from=bazelbuild /opt/go/bin/buildozer /opt/go/bin/buildozer
 
 #------------------------------------------------------------------------
 # ORT
-FROM base as ortbuild
+FROM base AS ortbuild
 
 # Set this to the version ORT should report.
 ARG ORT_VERSION="DOCKER-SNAPSHOT"
@@ -462,7 +462,7 @@ COPY --from=ortbuild /opt/ort /opt/ort
 
 #------------------------------------------------------------------------
 # Container with minimal selection of supported package managers.
-FROM base as minimal-tools
+FROM base AS minimal-tools
 
 # Remove ort build scripts
 RUN [ -d /etc/scripts ] && sudo rm -rf /etc/scripts
@@ -508,7 +508,7 @@ COPY --from=scancode-license-data --chown=$USER:$USER /opt/scancode-license-data
 
 #------------------------------------------------------------------------
 # Container with all supported package managers.
-FROM minimal-tools as all-tools
+FROM minimal-tools AS all-tools
 
 # Repo and Android
 ENV ANDROID_HOME=/opt/android-sdk
@@ -573,7 +573,7 @@ COPY --from=bazel --chown=$USER:$USER /opt/go/bin/buildozer /opt/go/bin/buildoze
 
 #------------------------------------------------------------------------
 # Runtime container with minimal selection of supported package managers pre-installed.
-FROM minimal-tools as minimal
+FROM minimal-tools AS minimal
 
 # ORT
 COPY --from=ortbin --chown=$USER:$USER /opt/ort /opt/ort
@@ -589,7 +589,7 @@ ENTRYPOINT ["/opt/ort/bin/ort"]
 
 #------------------------------------------------------------------------
 # Runtime container with all supported package managers pre-installed.
-FROM all-tools as run
+FROM all-tools AS run
 
 # ORT
 COPY --from=ortbin --chown=$USER:$USER /opt/ort /opt/ort