Add autoconf cloud-builder

autoconf/Dockerfile

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+FROM debian
+
+RUN apt-get update && apt-get install -y \
+  autoconf \
+  build-essential \
+  ca-certificates \
+  curl \
+  git \
+  libtool \
+  pkg-config \
+  wget \
+  ;
+
+ENTRYPOINT ["autoconf"]

autoconf/README.md

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+# autoconf
+
+This build step provides a container with the build-essentials and autoconf
+packages installed. It is intended for running automake targets. Git is included
+as well since autoconf scripts tend to read git status for baking version info
+into programs.
+
+It is capable of running simple GCC builds, but the primary use is in conjuction
+with other containers as part of a Google Container Builder configuration.
+
+The entrypoint for this container is autoconf.

autoconf/cloudbuild.yaml

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+# In this directory, run the following command to build this builder.
+# $ gcloud builds submit . --config=cloudbuild.yaml
+
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  args: ['build', '-t', 'gcr.io/$PROJECT_ID/autoconf', '.']
+
+images:
+- 'gcr.io/$PROJECT_ID/autoconf'
+tags: ['cloud-builders-community']

autoconf/examples/Makefile.am

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+bin_PROGRAMS = hello
+hello_SOURCES = hello.c

autoconf/examples/cloudbuild.yaml

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+# In this directory, run the following command to build this builder.
+# $ gcloud builds submit . --config=cloudbuild.yaml
+
+steps:
+- name: gcr.io/$PROJECT_ID/autoconf
+  entrypoint: aclocal
+- name: gcr.io/$PROJECT_ID/autoconf
+  entrypoint: autoheader
+- name: gcr.io/$PROJECT_ID/autoconf
+  entrypoint: autoconf
+- name: gcr.io/$PROJECT_ID/autoconf
+  entrypoint: automake
+  args: ["--add-missing", "--copy"]
+- name: gcr.io/$PROJECT_ID/autoconf
+  script: ./configure
+- name: gcr.io/$PROJECT_ID/autoconf
+  script: "make && ./hello"
+tags: ["cloud-builders-community"]

autoconf/examples/configure.ac

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+AC_INIT([hello], [1.0], [your-email@example.com])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign])
+AC_CONFIG_SRCDIR([hello.c])
+AC_CONFIG_HEADERS([config.h])
+
+# Checks for programs.
+AC_PROG_CC
+
+# Optional feature (example)
+AC_ARG_ENABLE([greeting],
+              [AS_HELP_STRING([--enable-greeting],
+                              [enable a more verbose greeting])],
+              [enable_greeting=$enableval],
+              [enable_greeting=no])
+
+if test "x$enable_greeting" = "xyes"; then
+  AC_DEFINE([ENABLE_GREETING], [1], [Define to enable the verbose greeting.])
+fi
+
+# Output files to generate
+AC_CONFIG_FILES([Makefile])
+
+# Output summary of configuration
+AC_OUTPUT

autoconf/examples/hello.c

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+#include <stdio.h>
+#include "config.h" // For PACKAGE and VERSION
+
+int main() {
+#ifdef ENABLE_GREETING
+    printf("%s %s!\n", PACKAGE, VERSION);
+#else
+    printf("Hello, World!\n");
+#endif
+    return 0;
+}