Made curl download silent to avoid stderr messages

Author: Chuxel

containers/java-11/.devcontainer/Dockerfile

@@ -17,7 +17,7 @@ RUN apt-get -y install git procps curl
 ENV GRADLE_HOME /opt/gradle
 ENV GRADLE_VERSION 5.4
 ARG GRADLE_DOWNLOAD_SHA256=c8c17574245ecee9ed7fe4f6b593b696d1692d1adbfef425bef9b333e3a0e8de
-RUN curl -SL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
+RUN curl -sSL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
     && echo "${GRADLE_DOWNLOAD_SHA256} *gradle.zip" | sha256sum --check - \
     && unzip gradle.zip \
     && rm gradle.zip \

containers/java-12/.devcontainer/Dockerfile

@@ -16,7 +16,7 @@ RUN yum install -y git curl procps unzip
 ENV GRADLE_HOME /opt/gradle
 ENV GRADLE_VERSION 5.4
 ARG GRADLE_DOWNLOAD_SHA256=c8c17574245ecee9ed7fe4f6b593b696d1692d1adbfef425bef9b333e3a0e8de
-RUN curl -SL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
+RUN curl -sSL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
     && echo "${GRADLE_DOWNLOAD_SHA256} *gradle.zip" | sha256sum --check - \
     && unzip gradle.zip \
     && rm gradle.zip \

containers/java-8/.devcontainer/Dockerfile

@@ -17,7 +17,7 @@ RUN apt-get -y install git procps curl
 ENV GRADLE_HOME /opt/gradle
 ENV GRADLE_VERSION 5.4
 ARG GRADLE_DOWNLOAD_SHA256=c8c17574245ecee9ed7fe4f6b593b696d1692d1adbfef425bef9b333e3a0e8de
-RUN curl -SL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
+RUN curl -sSL --output gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
     && echo "${GRADLE_DOWNLOAD_SHA256} *gradle.zip" | sha256sum --check - \
     && unzip gradle.zip \
     && rm gradle.zip \